diff --git a/scripts/run-shellcheck.sh b/scripts/run-shellcheck.sh
index 475f426..d6c2db6 100755
--- a/scripts/run-shellcheck.sh
+++ b/scripts/run-shellcheck.sh
@@ -1,21 +1,29 @@
-#!/bin/sh
+#!/bin/sh -eu
 
-SHELLCHECKCMD="shellcheck -s sh -f gcc -x"
+SHELLCHECKCMD='shellcheck -s sh -f gcc -x'
 # Skip SC2154 for variables starting with __ since such variables are cdist
 # environment variables.
 SHELLCHECK_SKIP=': __.*is referenced but not assigned.*\[SC2154\]'
-SHELLCHECKTMP=".shellcheck.tmp"
+SHELLCHECKTMP='.shellcheck.tmp'
 
 # Move to top-level cdist-contrib directory.
-cd $(dirname $0)/..
+cd "$(dirname $0)"/..
 
-check () {
-	find type/ -type f $1 $2 -exec ${SHELLCHECKCMD} {} + | grep -v "${SHELLCHECK_SKIP}"  > "${SHELLCHECKTMP}"
-	test ! -s "${SHELLCHECKTMP}" || { cat "${SHELLCHECKTMP}"; exit 1; }
+check() {
+	find type/ -type f "$@" -exec ${SHELLCHECKCMD} {} + \
+	| grep -v "${SHELLCHECK_SKIP}" >>"${SHELLCHECKTMP}" || true
 }
 
-check -path "*/explorer/*"
-check -path "*/files/*.sh"
+rm -f "${SHELLCHECKTMP}"
+
+check -path '*/explorer/*'
+check -path '*/files/*' -name '*.sh'
 check -name manifest
 check -name gencode-local
 check -name gencode-remote
+
+if test -s "${SHELLCHECKTMP}"
+then
+	cat "${SHELLCHECKTMP}" >&2
+	exit 1
+fi
diff --git a/type/__dma/explorer/auth_conf b/type/__dma/explorer/auth_conf
new file mode 100755
index 0000000..cef0aca
--- /dev/null
+++ b/type/__dma/explorer/auth_conf
@@ -0,0 +1,49 @@
+#!/bin/sh -e
+#
+# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+# This explorer determines the path of dma's auth.conf file
+
+# No dma.conf -> use default
+test -f /etc/dma/dma.conf || {
+	echo /etc/dma/auth.conf
+	exit 0
+}
+test -r /etc/dma/dma.conf || {
+	echo 'Cannot read /etc/dma/dma.conf' >&2
+	exit 1
+}
+
+# Get AUTHPATH from dma.conf
+awk -F'[ \t]' '
+{
+	sub(/#.*$/, "", $0)  # remove comments
+	if (!$0) next  # ignore empty lines
+}
+$1 == "AUTHPATH" {
+	# Store authpath. In dma conf parsing last wins.
+	if ($2) authpath = substr($0, index($0, " ") + 1)
+}
+END {
+	if (authpath) {
+		print authpath
+		exit 0
+	} else exit 1
+}
+' /etc/dma/dma.conf \
+|| echo /etc/dma/auth.conf  # default
diff --git a/type/__dma/explorer/conf b/type/__dma/explorer/conf
new file mode 100755
index 0000000..b4d6d26
--- /dev/null
+++ b/type/__dma/explorer/conf
@@ -0,0 +1,34 @@
+#!/bin/sh -e
+#
+# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+# This explorer returns a sorted list of "active" (= non-commented) lines
+# in the dma.conf file.
+# "Trailing" line comments are stripped off.
+#
+# NOTE: This explorer assumes that the sort(1) utility supports the non-POXIX
+#       -s (stable sort) option.
+
+CONF_PATH=/etc/dma  # set in Makefile
+dma_conf="${CONF_PATH:?}/dma.conf"
+
+test -f "${dma_conf}" || exit 0
+
+grep -v -e '^[ \t]*#\|^$' "${dma_conf}" \
+| sed -e 's/[ \t]*#.*$//' \
+| sort -s -k 1,1
diff --git a/type/__dma/files/update_dma_conf.awk b/type/__dma/files/update_dma_conf.awk
new file mode 100644
index 0000000..15ef7bf
--- /dev/null
+++ b/type/__dma/files/update_dma_conf.awk
@@ -0,0 +1,178 @@
+#!/usr/bin/awk -f
+#
+# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+
+function comment_line(line) {
+	# returns the position in line at which the comment's text starts
+	# (0 if the line is not a comment)
+	match(line, /^[ \t]*\#+[ \t]*/)
+	return RSTART ? (RLENGTH + 1) : 0
+}
+function empty_line(line) { return line ~ /^[ \t]*$/ }
+function is_word(s) { return s ~ /^[A-Z_]+$/ }  # "looks like a plausible word"
+
+function first(line, sep_re) {
+	# returns the part of the line until sep is found
+	# (or the whole line if sep is not found)
+	if (!sep_re) sep_re = "[" SUBSEP "]"
+	match(line, sep_re)
+	return RSTART ? substr(line, 1, RSTART - 1) : line
+}
+
+function rest(line, sep_re) {
+	# returns the part of the line after the first occurrence of sep is found.
+	# (or nothing if sep is not found)
+	if (!sep_re) sep_re = "[" SUBSEP "]"
+	if (match(line, sep_re))
+		return substr(line, RSTART + RLENGTH)
+}
+
+function conf_pop(word, value) {
+	# returns the next value for the config `word` and delete it from the list.
+	# if value is set, this function will only return value if it is the first
+	# option in the list, otherwise it returns 0.
+
+	if (!(word in conf)) return 0
+	if (!value) {
+		if (index(conf[word], SUBSEP))  # more than one element?
+			value = substr(conf[word], 1, index(conf[word], SUBSEP) - 1)
+		else
+			value = conf[word]
+	}
+
+	if (index(conf[word], SUBSEP)) {
+		if (index(conf[word], value SUBSEP) != 1) return 0
+		conf[word] = substr(conf[word], length(value) + 2)
+	} else {
+		if (conf[word] != value) return 0
+		delete conf[word]
+	}
+	return value
+}
+
+function print_conf(word, value) {
+	# print a config line with the given parameters
+	printf "%s", word
+	if (value) printf " %s", value
+	printf "\n"
+}
+
+function print_confs(word,    value) {
+	# print config lines for all values stored in conf[word].
+	if (!(word in conf)) return
+	if (conf[word]) {
+		while (value = conf_pop(word))
+			print_conf(word, value)
+	} else {
+		print_conf(word)
+		delete conf[word]
+	}
+}
+
+BEGIN {
+	FS = "\n"
+	EQS = "[ \t]"  # copied from dma/conf.c
+
+	if (ARGV[2]) exit (e=1)
+
+	# Loop over file twice!
+	ARGV[2] = ARGV[1]
+	ARGC++
+
+	# read the "should" state into the `conf` array.
+	while (getline < "/dev/stdin") {
+		word = first($0, EQS)
+		if ((word in conf))
+			conf[word] = conf[word] SUBSEP rest($0, EQS)
+		else
+			conf[word] = rest($0, EQS)
+	}
+}
+
+# first pass, gather information about where which information is stored in the
+# current config file. This information will be used in the second pass.
+NR == FNR {
+	if (comment_line($0)) {
+		# comment line
+		word = first(substr($0, comment_line($0)), " ")
+		if (is_word(word)) last_occ["#" word] = FNR
+	} else {
+		word = first($0, EQS)
+		if (is_word(word)) last_occ[word] = FNR
+	}
+}
+
+# before second pass prepare hashes containing location information to be used
+# in the second pass.
+NR > FNR && FNR == 1 {
+	# First we drop the locations of commented-out options if a non-commented
+	# option is available. If a non-commented option is available, we will
+	# append new config options there to have them all at one place.
+	for (k in last_occ)
+		if (k ~ /^\#/ && (substr(k, 2) in last_occ))
+			delete last_occ[k]
+
+	# Reverse the option => line mapping. The line_map allows for easier lookups
+	# in the second pass.
+	for (k in last_occ) line_map[last_occ[k]] = k
+}
+
+# second pass, generate and output new config
+NR > FNR {
+	if (comment_line($0) || empty_line($0)) {
+		# comment or empty line
+		print
+
+		if ((FNR in line_map)) {
+			if (line_map[FNR] ~ /^\#/) {
+				# This line contains a commented config option. If the conf hash
+				# contains options to be set, we output them here because this
+				# option is not used in the current config.
+				k = substr(line_map[FNR], 2)
+				if ((k in conf)) print_confs(k)
+			}
+
+			if (("INSECURE" in conf) && line_map[FNR] ~ /^\#?SECURE$/) {
+				# INSECURE goes where SECURE comment is.
+				print_confs("INSECURE")
+			}
+		}
+	} else {
+		word = first($0, EQS)
+		value = rest($0, EQS)
+		sub(/[ \t]*\#.*$/, "", value)  # ignore comments in value
+
+		if ((word in conf) && value == first(conf[word])) {
+			# keep config options we want
+			conf_pop(word)
+			print
+		}
+
+		if ((FNR in line_map) && line_map[FNR] == word) {
+			# rest of config options should be here
+			print_confs(word)
+		}
+	}
+}
+
+END {
+	if (e) exit
+
+	# print rest of config options (
+	for (word in conf) print_confs(word)
+}
diff --git a/type/__dma/gencode-remote b/type/__dma/gencode-remote
new file mode 100755
index 0000000..580b22e
--- /dev/null
+++ b/type/__dma/gencode-remote
@@ -0,0 +1,177 @@
+#!/bin/sh -e
+#
+# 2020 Dennis Camera (dennis.camera@ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+
+quote() { printf "'%s'" "$(printf '%s' "$*" | sed -e "s/'/'\\\\''/g")"; }
+drop_awk_comments() { quote "$(sed '/^[[:blank:]]*#.*$/d;/^$/d' "$@")"; }
+
+CONF_PATH=/etc/dma  # set in Makefile
+
+# Determine mailname
+if test -f "${__object:?}/parameter/mailname"
+then
+	mailname=$(cat "${__object:?}/parameter/mailname")
+else
+	case $(cat "${__global:?}/explorer/os")
+	in
+		(debian|devuan|ubuntu)
+			# On Debian-like systems use /etc/mailname unless --mailname is used
+			mailname='/etc/mailname'
+			;;
+		(*)
+			mailname=${__target_fqdn:?}
+			;;
+	esac
+fi
+
+
+# Generate "should" values for config
+conf_should=$(
+	if test -s "${__object:?}/parameter/smarthost"
+	then
+		printf 'SMARTHOST %s\n' "$(cat "${__object:?}/parameter/smarthost")"
+	fi
+
+	printf 'MAILNAME %s\n' "${mailname}"
+
+	if test -s "${__object:?}/explorer/auth_conf"
+	then
+		printf "AUTHPATH %s\n" "$(cat "${__object:?}/explorer/auth_conf")"
+	fi
+
+	case $(cat "${__object:?}/parameter/security")
+	in
+		(ssl|tls)
+			default_smtp_port=465
+			echo 'SECURETRANSFER'
+			;;
+		(starttls)
+			default_smtp_port=587
+			echo 'SECURETRANSFER'
+			echo 'STARTTLS'
+			;;
+		(opportunistic)
+			default_smtp_port=25
+			echo 'SECURETRANSFER'
+			echo 'STARTTLS'
+			echo 'OPPORTUNISTIC_TLS'
+			;;
+		(insecure)
+			default_smtp_port=25
+			echo 'INSECURE'
+			;;
+	esac
+
+	if test -s "${__object:?}/parameter/port"
+	then
+		printf 'PORT %u\n' "$(cat "${__object:?}/parameter/port")"
+	elif test "${default_smtp_port}" -ne 25  # DMA uses port 25 by default
+	then
+		printf 'PORT %u\n' "${default_smtp_port}"
+	fi
+
+	if test -f "${__object:?}/parameter/masquerade"
+	then
+		while read -r line
+		do
+			printf 'MASQUERADE %s\n' "${line}"
+		done <"${__object:?}/parameter/masquerade"
+	fi
+
+	if test -f "${__object:?}/parameter/defer"
+	then
+		echo 'DEFER'
+	fi
+
+	if test -f "${__object:?}/parameter/fullbounce"
+	then
+		echo 'FULLBOUNCE'
+	fi
+
+	if test -f "${__object:?}/parameter/nullclient"
+	then
+		test -s "${__object:?}/parameter/smarthost" || {
+			echo '--nullclient requires a --smarthost to be defined' >&2
+			exit 1
+		}
+
+		echo 'NULLCLIENT'
+	fi
+)
+# Sort conf_should to compare against "conf_is"
+conf_should=$(echo "${conf_should}" | sort -s -k 1,1)
+
+config_updated=false
+if ! echo "${conf_should}" | cmp -s "${__object:?}/explorer/conf" -
+then
+	# config needs to be updated
+	dma_conf="${CONF_PATH:?}/dma.conf"
+
+	# The following AWK script will output the new config file to be stored on
+	# disk. To do so it reads the current dma.conf file and the config options
+	# that should be set (from stdin).
+	# Note that the path to the current dma.conf is passed to AWK twice, because
+	# the new file cannot be generated in one pass.
+
+	# The logic tries to place options at a sensible location, that is:
+	# a) if the option is already used in the config file:
+	#    group all similar options (e.g. MASQUERADE) at one place in the order
+	#    they are listed in stdin.
+	# b) if it is a new option and a "default comment" (e.g. "#PORT 25") exists:
+	#    place options grouped directly after the comment (the comment is left
+	#    alone)
+	# c) otherwise:
+	#    options are grouped by word (the first word in the line) and appended
+	#    at the end of the file.
+
+	cat <<-CODE
+	awk $(drop_awk_comments "${__type:?}/files/update_dma_conf.awk") $(quote "${dma_conf}") <<'EOF' >$(quote "${dma_conf}.tmp") \
+	&& cat $(quote "${dma_conf}.tmp") >$(quote "${dma_conf}")
+	${conf_should}
+	EOF
+	rm $(quote "${dma_conf}.tmp")
+	CODE
+
+	config_updated=true
+	echo 'config updated' >>"${__messages_out:?}"
+fi
+
+
+# Send a test email if enabled and necessary (=configuration changed)
+if test -f "${__object:?}/parameter/send-test-mail"
+then
+	if grep -q '^__mail_alias/root:' "${__messages_in:?}" \
+	|| grep -q '^__dma_auth/' "${__messages_in:?}" \
+	|| ${config_updated}
+	then
+		cat <<-CODE
+		sendmail root <<'EOF'
+		Subject: [cdist] Test mail from '${__target_fqdn:?}'
+
+		Hi,
+
+		you can ignore this message.
+		Its sole purpose is to notify you that root mail on ${__target_fqdn:?}
+		will be redirected to you.
+
+		Enjoy!
+		EOF
+		CODE
+	fi
+fi
diff --git a/type/__dma/man.rst b/type/__dma/man.rst
new file mode 100644
index 0000000..29a71fa
--- /dev/null
+++ b/type/__dma/man.rst
@@ -0,0 +1,112 @@
+cdist-type__dma(7)
+============================
+
+NAME
+----
+cdist-type__dma - Setup the DragonFly Mail Agent as the MTA.
+
+
+DESCRIPTION
+-----------
+This (singleton) type uses DMA, a small Mail Transport Agent (MTA), to accept
+mails from locally installed Mail User Agents (MUA) and either deliver the mails
+to a remote smart host for delivery or communicate with remote SMTP servers
+directly.
+
+
+REQUIRED PARAMETERS
+-------------------
+None.
+
+
+BOOLEAN PARAMETERS
+------------------
+defer
+    If enabled, mail will not be sent immediately, but stored in a queue.
+    To flush the queue and send the mails, ```dma -q`` has to be run
+    periodically (e.g. using a cron job.)
+    This type does not manage such a cron job, but some operating systems ship
+    such a cron job with the package.
+fullbounce
+    Enable if bounce messages should include the complete original message,
+    not just the headers.
+nullclient
+    Enable to bypass aliases and local delivery, and instead forward all mails
+    to the defined ``--smarthost``.
+send-test-mail
+    If set, this type will send a test email to root after setup, to check if
+    the configured settings work.
+
+
+OPTIONAL PARAMETERS
+-------------------
+mailname
+    If present, this will be the hostname used to identify this host and the
+    remote part of the sender addresses.
+    If not defined, it defaults to ``/etc/mailname`` on Debian derivatives and
+    to ``__target_fqdn`` otherwise.
+    See `dma(8)` for more information.
+
+    Note: on Debian derivatives the ``/etc/mailname`` file should be updated
+    instead of using this parameter.
+masquerade
+    Masquerade the envelope-from addresses with this address/hostname.
+    Use this setting if mails are not accepted by destination mail servers
+    because your sender domain is invalid.
+    This option can be used multiple times.
+    For more information see the `dma(8)` man page.
+port
+    The port on which to deliver email.
+    If not provided, a sensible default port will be used based on the
+    ``--security`` argument.
+security
+    Configures whether and how DMA should use secure connections.
+
+    ssl/tls
+        Enable TLS/SSL secured transfer.
+    starttls
+        Use STARTTLS to establish a secure connection.
+    opportunistic (default)
+        Will try to establish a secure connection using STARTTLS, but allow
+        unencrypted transfer if STARTTLS fails.
+        Most useful when dma is used without a smarthost, delivering remote
+        messages directly to the outside mail exchangers.
+    insecure
+        allow plain text SMTP login over an insecure connection.
+        Should really *not* be used anymore!
+smarthost
+    The mail server used to send email.
+    It must be configured to act as a relay for the host being configured by
+    this type so that mail can be sent to users non-local to the smarthost.
+
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+    # Install DMA and use the smarthost mx1.domain.tld to send mail.
+    __dma --smarthost mx1.domain.tld --send-test-mail
+
+    # Install DMA in a default configuration.
+    __dma
+
+
+SEE ALSO
+--------
+- `DragonFly Mail Agent <https://github.com/corecode/dma>`_
+- `DragonFly Handbook MTA <https://www.dragonflybsd.org/handbook/mta/>`_
+
+
+AUTHORS
+-------
+Evilham <contact@evilham.com>
+Dennis Camera <dennis.camera@ssrq-sds-fds.ch>
+
+
+COPYING
+-------
+Copyright \(C) 2020 Evilham and Dennis Camera. You can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
diff --git a/type/__dma/manifest b/type/__dma/manifest
new file mode 100755
index 0000000..530ad09
--- /dev/null
+++ b/type/__dma/manifest
@@ -0,0 +1,66 @@
+#!/bin/sh -e
+#
+# 2020 Dennis Camera (dennis.camera@ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+
+os=$(cat "${__global:?}/explorer/os")
+
+# Install DMA
+case ${os}
+in
+	(alpine)
+		__package dma --state present
+		export require='__package/dma'
+		;;
+	(debian|devuan|ubuntu)
+		__package dma --state present
+		export require='__package/dma'
+		;;
+	(freebsd)
+		# Stop sendmail if necessary
+		__process 'sendmail' --name 'sendmail.*' --state absent \
+			--stop '/etc/rc.d/sendmail onestop'
+
+		# ... and disable it
+		__key_value 'rcconf-sendmail-enable' --file '/etc/rc.conf' \
+			--key 'sendmail_enable' --delimiter '=' --value '"NONE"' \
+			--exact_delimiter
+
+		# Setup mailwrapper accordingly
+		__file '/etc/mail/mailer.conf' --mode 0644 --source - <<-'EOF'
+			#
+			# Execute the "real" sendmail program, named /usr/libexec/sendmail/sendmail
+			#
+			sendmail	/usr/libexec/dma
+			send-mail	/usr/libexec/dma
+			mailq		/usr/libexec/dma
+			newaliases	/usr/libexec/dma
+			rmail		/usr/libexec/dma
+		EOF
+		;;
+	(*)
+		cat <<EOF >&2
+Your OS (${os}) is not supported yet.
+
+Maybe adding support is as simple as adapting the packages or allowing it,
+we highly encourage you to open a PR with the necessary changes.
+See: https://code.ungleich.ch/ungleich-public/cdist-contrib/
+EOF
+		exit 1
+		;;
+esac
diff --git a/type/__dma/parameter/boolean b/type/__dma/parameter/boolean
new file mode 100644
index 0000000..523bb97
--- /dev/null
+++ b/type/__dma/parameter/boolean
@@ -0,0 +1,4 @@
+defer
+fullbounce
+nullclient
+send-test-mail
diff --git a/type/__dma/parameter/default/security b/type/__dma/parameter/default/security
new file mode 100644
index 0000000..9f1e0a6
--- /dev/null
+++ b/type/__dma/parameter/default/security
@@ -0,0 +1 @@
+opportunistic
diff --git a/type/__dma/parameter/optional b/type/__dma/parameter/optional
new file mode 100644
index 0000000..615c189
--- /dev/null
+++ b/type/__dma/parameter/optional
@@ -0,0 +1,4 @@
+mailname
+port
+security
+smarthost
diff --git a/type/__dma/parameter/optional_multiple b/type/__dma/parameter/optional_multiple
new file mode 100644
index 0000000..70f4146
--- /dev/null
+++ b/type/__dma/parameter/optional_multiple
@@ -0,0 +1 @@
+masquerade
diff --git a/type/__dma/singleton b/type/__dma/singleton
new file mode 100644
index 0000000..e69de29
diff --git a/type/__dma_auth/explorer/auth_conf b/type/__dma_auth/explorer/auth_conf
new file mode 120000
index 0000000..e89de93
--- /dev/null
+++ b/type/__dma_auth/explorer/auth_conf
@@ -0,0 +1 @@
+../../__dma/explorer/auth_conf
\ No newline at end of file
diff --git a/type/__dma_auth/explorer/state b/type/__dma_auth/explorer/state
new file mode 100755
index 0000000..c829cd4
--- /dev/null
+++ b/type/__dma_auth/explorer/state
@@ -0,0 +1,91 @@
+#!/bin/sh -e
+#
+# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+# This explorer looks for a line matching the server parameter
+# in dma's auth.conf and reports:
+#   present:            a line matching login + host + password exists
+#   absent:             no line matching login + host exists
+#   different_login:    a line exists but with a different login user
+#   different_password: a line exists but with a different password
+#   multiple:           multiple lines matching host exist (should not happen)
+
+auth_conf=$("${__type_explorer:?}/auth_conf")
+test -r "${auth_conf}" || exit 0
+
+awk -F'\n' '
+function getvalue(path) {
+	# Reads the first line of the file located at path and returns it.
+	getline < path
+	close(path)
+	return $0
+}
+
+BEGIN {
+	DP = "[: \t]"  # copied from dma/conf.c
+
+	parameter_dir = ENVIRON["__object"] "/parameter/"
+
+	# Read the parameters of this object
+	host_param = ENVIRON["__object_id"]
+	login_param = getvalue(parameter_dir "login")
+	passwd_param = getvalue(parameter_dir "password")
+
+	state = "absent"
+}
+
+/^#/ || /^$/ {
+	# skip comments and empty lines
+	next
+}
+
+{
+	# parse line
+
+	login = substr($0, 1, index($0, "|") - 1)
+	if (!login) { login = $0 }  # if no "|" found
+
+	host = substr($0, length(login) + 2)
+
+	if (match(host, DP)) {
+		passwd = substr(host, RSTART + 1)
+		host = substr(host, 1, RSTART - 1)
+	} else {
+		passwd = ""
+	}
+}
+
+host == host_param {
+	# a match…
+	if (state == "absent") {
+		if (login != login_param)
+			state = "different_login"
+		else if (passwd != passwd_param)
+			state = "different_password"
+		else
+			state = "present"
+	} else {
+		# report "multiple" to that the type can remove the duplicates.
+		state = "multiple"
+	}
+}
+
+END {
+	print state
+}
+' "${auth_conf}"
diff --git a/type/__dma_auth/files/update_dma_auth.awk b/type/__dma_auth/files/update_dma_auth.awk
new file mode 100644
index 0000000..c50198b
--- /dev/null
+++ b/type/__dma_auth/files/update_dma_auth.awk
@@ -0,0 +1,93 @@
+#!/usr/bin/awk -f
+#
+# 2020 Dennis Camera (dennis.camera@ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+
+function getvalue(path) {
+	# Reads the first line of the file located at path and returns it.
+	getline < path
+	close(path)
+	return $0
+}
+
+function print_should() {
+	printf "%s|%s:%s\n", login_param, host_param, passwd_param
+}
+
+BEGIN {
+	FS = "\n"
+	DP = "[: \t]"  # copied from dma/conf.c
+
+	parameter_dir = ENVIRON["__object"] "/parameter/"
+
+	mode = (getvalue(parameter_dir "state") != "absent")
+
+	host_param = ENVIRON["__object_id"]
+	login_param = getvalue(parameter_dir "login")
+	passwd_param = getvalue(parameter_dir "password")
+}
+
+# skip comments and empty lines
+/^#/ || /^$/ {
+	print
+	next
+}
+
+{
+	# parse line (like dma/conf.c would)
+
+	login = substr($0, 1, index($0, "|") - 1)
+	if (!login) { login = $0 }  # if no "|" found
+
+	host = substr($0, length(login) + 2)
+
+	if (match(host, DP)) {
+		passwd = substr(host, RSTART + 1)
+		host = substr(host, 1, RSTART - 1)
+	} else {
+		passwd = ""
+	}
+}
+
+host == host_param {
+	if (mode) {
+		# state_should == present
+		if (!written) {
+			# replace first line if host matches (but only if no line has
+			# been written already -> no duplicates)
+			print_should()
+			written = 1
+		}
+		next
+	} else {
+		# state_should == absent
+		next
+	}
+}
+
+# leave other lines alone
+{
+	print
+}
+
+END {
+	if (mode && !written) {
+		# append line if no match to replace was found
+		print_should()
+	}
+}
diff --git a/type/__dma_auth/gencode-remote b/type/__dma_auth/gencode-remote
new file mode 100755
index 0000000..b6a0100
--- /dev/null
+++ b/type/__dma_auth/gencode-remote
@@ -0,0 +1,72 @@
+#!/bin/sh -e
+#
+# 2020 Dennis Camera (dennis.camera@ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+
+quote() { printf "'%s'" "$(printf '%s' "$*" | sed -e "s/'/'\\\\''/g")"; }
+drop_awk_comments() { quote "$(sed '/^[[:blank:]]*#.*$/d;/^$/d' "$@")"; }
+
+state_is=$(cat "${__object:?}/explorer/state")
+state_should=$(cat "${__object:?}/parameter/state")
+
+server=${__object_id:?}
+login=$(cat "${__object:?}/parameter/login")
+
+
+auth_conf=$(cat "${__object:?}/explorer/auth_conf")
+test -n "${auth_conf}" || {
+	echo 'Cannot determine path of dma auth.conf' >&2
+	exit 1
+}
+
+if test "${state_is}" = "${state_should}"
+then
+	# state is as it should
+	exit 0
+fi
+
+case ${state_should}
+in
+	(present)
+		test -n "${login}" || { echo '--login must be non-empty' >&2; exit 1; }
+
+		if test "${state_is}" = 'absent'
+		then
+			printf 'add authuser %s on %s\n' "${login}" "${server}" >>"${__messages_out:?}"
+		else
+			printf 'set authuser %s on %s\n' "${login}" "${server}" >>"${__messages_out:?}"
+		fi
+		;;
+	(absent)
+		printf 'delete authuser %s on %s\n' "${login}" "${server}" >>"${__messages_out:?}"
+		;;
+	(*)
+		printf 'Invalid --state: %s.\n' "${state_should}" >&2
+		printf 'Acceptable values are: present, absent.\n' >&2
+		exit 1
+		;;
+esac
+
+
+cat <<EOF
+test -f $(quote "${auth_conf}") || touch $(quote "${auth_conf}")
+
+awk $(drop_awk_comments "${__type:?}/files/update_dma_auth.awk") <$(quote "${auth_conf}") >$(quote "${auth_conf}.tmp") \
+&& cat $(quote "${auth_conf}.tmp") >$(quote "${auth_conf}")
+rm -f $(quote "${auth_conf}.tmp")
+EOF
diff --git a/type/__dma_auth/man.rst b/type/__dma_auth/man.rst
new file mode 100644
index 0000000..da76883
--- /dev/null
+++ b/type/__dma_auth/man.rst
@@ -0,0 +1,66 @@
+cdist-type__dma_auth(7)
+=======================
+
+NAME
+----
+cdist-type__dma_auth - Configure SMTP logins for the DragonFly Mail Agent MTA.
+
+
+DESCRIPTION
+-----------
+This cdist type allows you to set up credentials to log in to remote SMTP
+servers.
+
+NB: dma currently (v0.13) does not differentiate between users on a host.
+    It will use whatever user it finds in the ``auth.conf`` first.
+    Thus, this type will use the ``__object_id`` as the host specifier.
+
+
+REQUIRED PARAMETERS
+-------------------
+login
+    The user's LOGIN name on the SMTP server.
+password
+    The user's password (in plain text.)
+
+
+OPTIONAL PARAMETERS
+-------------------
+state
+    Either ``present`` or ``absent``. Defaults to ``present``.
+
+BOOLEAN PARAMETERS
+------------------
+None.
+
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+    # Set the password for smarthost
+    __dma_auth smarthost.example.com --login joe --password hunter2
+
+    # Set credentials for user at an external provider
+    __dma_auth mail.provider.com --login paul@example.com --password letmein
+
+    # Delete credentials for example.com (for all users)
+    __dma_auth example.com --login '' --password '' --state absent
+
+SEE ALSO
+--------
+:strong:`cdist-type__dma`\ (7), :strong:`dma`\ (8)
+
+
+AUTHORS
+-------
+Dennis Camera <dennis.camera@ssrq-sds-fds.ch>
+
+
+COPYING
+-------
+Copyright \(C) 2020 Dennis Camera. You can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
diff --git a/type/__dma_auth/nonparallel b/type/__dma_auth/nonparallel
new file mode 100644
index 0000000..e69de29
diff --git a/type/__dma_auth/parameter/default/state b/type/__dma_auth/parameter/default/state
new file mode 100644
index 0000000..e7f6134
--- /dev/null
+++ b/type/__dma_auth/parameter/default/state
@@ -0,0 +1 @@
+present
diff --git a/type/__dma_auth/parameter/optional b/type/__dma_auth/parameter/optional
new file mode 100644
index 0000000..ff72b5c
--- /dev/null
+++ b/type/__dma_auth/parameter/optional
@@ -0,0 +1 @@
+state
diff --git a/type/__dma_auth/parameter/required b/type/__dma_auth/parameter/required
new file mode 100644
index 0000000..ae3c622
--- /dev/null
+++ b/type/__dma_auth/parameter/required
@@ -0,0 +1,2 @@
+login
+password
diff --git a/type/__mail_alias/explorer/aliases b/type/__mail_alias/explorer/aliases
new file mode 100755
index 0000000..ac13d7c
--- /dev/null
+++ b/type/__mail_alias/explorer/aliases
@@ -0,0 +1,73 @@
+#!/bin/sh -e
+#
+# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+# Find aliases for a given user name and print the aliases (each one on a
+# separate line)
+
+aliases_file=$("${__type_explorer:?}/aliases_file")
+test -r "${aliases_file}" || exit 0
+
+: "${__object_id:?}"  # assert __object_id is set, because it is used in AWK
+
+awk -F ':[ \t]*' '
+function print_aliases(aliases,    matches) {
+	# prints comma-separated aliases (one per line)
+	split(aliases, matches, /,[ \t]*/)
+	for (i in matches) {
+		gsub(/^[ \t]*|[ \t]*$/, "", matches[i])
+		if (matches[i]) print matches[i]
+	}
+}
+
+/^#/ {
+	# comment line (ignore)
+	select = 0; cont = 0  # comments terminate alias lists and continuations
+	next
+}
+
+{
+	# is this line a continuation line?
+	# (the prev. line ended in a backslash or the line starts with whitespace)
+	is_cont = /^[ \t]/ || cont
+
+	# detect if the line is a line to be continued (ends with a backslash)
+	cont = /\\$/
+
+	# if it is, we drop the backslash from the line
+	if (cont) sub(/[ \t]*\\$/, "", $0)
+}
+
+is_cont {
+	# if in the alias list of the "target" user, we also print these aliases.
+	if (select) print_aliases($0)
+	next
+}
+
+$1 == ENVIRON["__object_id"] {
+	# "target" user -> print alias list
+	select = 1
+	print_aliases($2)
+	next
+}
+
+{
+	# other user
+	select = 0
+}
+' "${aliases_file}"
diff --git a/type/__mail_alias/explorer/aliases_file b/type/__mail_alias/explorer/aliases_file
new file mode 100755
index 0000000..7f09f88
--- /dev/null
+++ b/type/__mail_alias/explorer/aliases_file
@@ -0,0 +1,52 @@
+#!/bin/sh -e
+#
+# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+# This explorer finds the aliases file to modify.
+
+found() { echo "$*"; exit 0; }
+
+check_file() {
+	if test -f "$1"
+	then
+		found "$1"
+	fi
+}
+
+case $("${__explorer:?}/os")
+in
+	(freebsd|openbsd|solaris)
+		check_file /etc/mail/aliases
+
+		# default
+		found /etc/mail/aliases
+		;;
+	(alpine|debian|devuan|ubuntu)
+		check_file /etc/aliases
+
+		# default
+		found /etc/aliases
+		;;
+	(*)
+		check_file /etc/mail/aliases
+		check_file /etc/aliases
+
+		# default
+		found /etc/aliases
+		;;
+esac
diff --git a/type/__mail_alias/files/update_aliases.awk b/type/__mail_alias/files/update_aliases.awk
new file mode 100644
index 0000000..11a4c85
--- /dev/null
+++ b/type/__mail_alias/files/update_aliases.awk
@@ -0,0 +1,96 @@
+#!/usr/bin/awk -f
+#
+# 2020 Dennis Camera (dennis.camera@ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+
+function getvalue(path,    line) {
+	# Reads the first line of the file located at path and returns it.
+	getline line < path
+	close(path)
+	return line
+}
+
+function sepafter(f, def,    _) {
+	# finds the separator between field $f and $(f+1)
+	_ = substr($0, length($f)+1, index(substr($0, length($f)+1), $(f+1))-1)
+	return _ ? _ : def
+}
+
+function write_aliases(    line) {
+	if (aliases_written) return
+
+	# print aliases line
+	printf "%s%s", ENVIRON["__object_id"], sepafter(1, ": ")
+	while ((getline line < aliases_should_file) > 0) {
+		if (aliases_written) printf ", "
+		printf "%s", line
+		aliases_written = 1
+	}
+	printf "\n"
+	close(aliases_should_file)
+}
+
+BEGIN {
+	FS = ":[ \t]*"
+
+	parameter_dir = ENVIRON["__object"] "/parameter/"
+
+	mode = (getvalue(parameter_dir "state") != "absent")
+	aliases_should_file = (parameter_dir "/alias")
+}
+
+/^[ \t]*\#/ {
+	# comment line (leave alone)
+	select = 0; cont = 0  # comments terminate alias lists and continuations
+	print
+	next
+}
+
+{
+	# is this line a continuation line?
+	# (the prev. line ended in a backslash or the line starts with whitespace)
+	is_cont = /^[ \t]/ || cont
+
+	# detect if the line is a line to be continued (ends with a backslash)
+	cont = /\\$/
+}
+
+is_cont {
+	# we only print the line if it has not been rewritten (select)
+	if (!select) print
+	next
+}
+
+$1 == ENVIRON["__object_id"] {
+	# "target" user -> rewrite aliases list
+	select = 1
+	if (mode) write_aliases()
+	next
+}
+
+{
+	# other user
+	select = 0
+	print
+}
+
+END {
+	# if the last line was an alias, the separator will be reused (looks better)
+	if (mode && !aliases_written)
+		write_aliases()
+}
diff --git a/type/__mail_alias/gencode-remote b/type/__mail_alias/gencode-remote
new file mode 100755
index 0000000..4a8f889
--- /dev/null
+++ b/type/__mail_alias/gencode-remote
@@ -0,0 +1,87 @@
+#!/bin/sh -e
+#
+# 2020 Dennis Camera (dennis.camera@ssrq-sds-fds.ch)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+
+quote() { printf "'%s'" "$(printf '%s' "$*" | sed -e "s/'/'\\\\''/g")"; }
+drop_awk_comments() { quote "$(sed '/^[[:blank:]]*#.*$/d;/^$/d' "$@")"; }
+
+aliases_file=$(cat "${__object:?}/explorer/aliases_file")
+
+test -n "${aliases_file}" || {
+	echo 'Could not determine aliases file path.' >&2
+	exit 1
+}
+
+
+state_should=$(cat "${__object:?}/parameter/state")
+
+case ${state_should}
+in
+	(present)
+		if cmp -s "${__object:?}/explorer/aliases" "${__object:?}/parameter/alias"
+		then
+			# all good!
+			exit 0
+		fi
+
+		test -s "${__object:?}/parameter/alias" || {
+			printf 'The --alias parameter is required if --state present.\n' >&2
+			printf 'Use --state absent to remove all aliases.\n' >&2
+			exit 1
+		}
+
+		if test -s "${__object:?}/explorer/aliases"
+		then
+			echo "update aliases" >>"${__messages_out:?}"
+		else
+			echo "add aliases" >>"${__messages_out:?}"
+		fi
+		;;
+	(absent)
+		# nothing to do if no aliases found.
+		test -s "${__object:?}/explorer/aliases" || exit 0
+
+		echo "delete aliases" >>"${__messages_out:?}"
+		;;
+	(*)
+		printf 'Invalid --state: %s.\n' "${state_should}" >&2
+		printf 'Acceptable values are: present, absent.\n' >&2
+		exit 1
+esac
+
+cat <<EOF
+test -f $(quote "${aliases_file}") || touch $(quote "${aliases_file}")
+
+awk $(drop_awk_comments "${__type:?}/files/update_aliases.awk") <$(quote "${aliases_file}") >$(quote "${aliases_file}.tmp") \
+|| {
+	rm -f $(quote "${aliases_file}.tmp")
+	echo 'Generating new aliases file failed!' >&2
+	exit 1
+}
+
+if ! cmp -s $(quote "${aliases_file}") $(quote "${aliases_file}.tmp")
+then
+	# aliases file was modified, replace:
+	cat $(quote "${aliases_file}.tmp") >$(quote "${aliases_file}")
+
+	# then, run newaliases if present ("missing" on Alpine Linux because of typo)
+	command -v newaliases >/dev/null 2>&1 && newaliases || true
+fi
+rm -f $(quote "${aliases_file}.tmp")
+EOF
diff --git a/type/__mail_alias/man.rst b/type/__mail_alias/man.rst
new file mode 100644
index 0000000..de40512
--- /dev/null
+++ b/type/__mail_alias/man.rst
@@ -0,0 +1,76 @@
+cdist-type__mail_alias(7)
+=========================
+
+NAME
+----
+cdist-type__mail_alias - Manage mail aliases.
+
+
+DESCRIPTION
+-----------
+This cdist type allows you to configure mail aliases (/etc/aliases).
+
+
+REQUIRED PARAMETERS
+-------------------
+None.
+
+
+OPTIONAL PARAMETERS
+-------------------
+state
+    'present' or 'absent', defaults to 'present'
+alias
+    an alias, i.e. a mail address where mail for the user should be redirected
+    to.
+    This parameter can be specified multiple times to redirect to multiple
+    recipients.
+    If ``--state`` is ``present`` this parameter is required.
+    See `aliases(5)` for the different forms this parameter can take.
+
+
+BOOLEAN PARAMETERS
+------------------
+None.
+
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+    # Redirect root mail to a "real" email address
+    __mail_alias root --alias admin@example.com
+
+    # Disable redirection of mail for joe
+    __mail_alias joe --state absent
+
+
+BUGS
+----
+- Quoted strings are not parsed by this type. As a result, aliases
+  containing ``,`` (commas) are treated incorrectly (they are treated as
+  separate aliases.)
+  Make sure that email addresses, file names, and pipe commands do not contain
+  commas.
+- ``:include:`` directives in the aliases file are not evaluated by this type.
+  They are treated like a regular alias, the values of the included file are
+  not expanded.
+
+
+SEE ALSO
+--------
+:strong:`aliases`\ (5)
+
+
+AUTHORS
+-------
+Dennis Camera <dennis.camera@ssrq-sds-fds.ch>
+
+
+COPYING
+-------
+Copyright \(C) 2020 Dennis Camera. You can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
diff --git a/type/__mail_alias/nonparallel b/type/__mail_alias/nonparallel
new file mode 100644
index 0000000..e69de29
diff --git a/type/__mail_alias/parameter/default/state b/type/__mail_alias/parameter/default/state
new file mode 100644
index 0000000..e7f6134
--- /dev/null
+++ b/type/__mail_alias/parameter/default/state
@@ -0,0 +1 @@
+present
diff --git a/type/__mail_alias/parameter/optional b/type/__mail_alias/parameter/optional
new file mode 100644
index 0000000..ff72b5c
--- /dev/null
+++ b/type/__mail_alias/parameter/optional
@@ -0,0 +1 @@
+state
diff --git a/type/__mail_alias/parameter/optional_multiple b/type/__mail_alias/parameter/optional_multiple
new file mode 100644
index 0000000..d077ed8
--- /dev/null
+++ b/type/__mail_alias/parameter/optional_multiple
@@ -0,0 +1 @@
+alias