diff --git a/type/__ungleich_matrix/man.rst b/type/__ungleich_matrix/man.rst
index b4b2903..b8583e4 100644
--- a/type/__ungleich_matrix/man.rst
+++ b/type/__ungleich_matrix/man.rst
@@ -8,8 +8,8 @@ cdist-type__ungleich_matrix - ungleich matrix enviroment
 
 DESCRIPTION
 -----------
-This type deploys a Matrix homeserver (synapse) and web client (element) on
-ungleich's infrastructure. This is a singleton type.
+This type deploys a Matrix homeserver (synapse) and optionally a web client
+(element) on ungleich's infrastructure. This is a singleton type.
 
 
 REQUIRED PARAMETERS
@@ -21,13 +21,6 @@ synapse-domain
   Public address of the Matrix homeserver. This must be a domain name, as it is
   used to generate TLS certificates and configuration for the web server.
 
-element-address
-  Public address of the Element web client. This must be a domain name, as it is
-  used to generate TLS certificates and configuration for the web server.
-
-element-version
-  Version of the Element client to be deployed.
-
 synapse-smtp-user
   SMTP user to ungleich's mail infrastructure. Used by Synapse to send
   notifications over email.
@@ -45,6 +38,14 @@ synapse-extra-parameters
 element-extra-parameters
   Extra parameters passed to the `__matrix_element` type.
 
+element-address
+  Public address of the Element web client. This must be a domain name, as it
+  is used to generate TLS certificates and configuration for the web server.
+  Element is only deployed if this parameter is set.
+
+element-version
+  Version of the Element client to be deployed.
+
 BOOLEAN PARAMETERS
 ------------------
 None.
diff --git a/type/__ungleich_matrix/manifest b/type/__ungleich_matrix/manifest
index 65a4dcf..b132404 100755
--- a/type/__ungleich_matrix/manifest
+++ b/type/__ungleich_matrix/manifest
@@ -35,9 +35,15 @@ SMTP_SERVER_PORT="587"
 
 # Type parameters.
 matrix_domain=$(cat "$__object/parameter/matrix-domain")
-element_domain=$(cat "$__object/parameter/element-domain")
 synapse_domain=$(cat "$__object/parameter/synapse-domain")
-element_version=$(cat "$__object/parameter/element-version")
+
+if [ -f "$__object/parameter/element-domain" ]; then
+	element_domain=$(cat "$__object/parameter/element-domain")
+	deploy_element=1
+fi
+if [ -f "$__object/parameter/element-version" ]; then
+	element_version=$(cat "$__object/parameter/element-version")
+fi
 
 synapse_smtp_user=$(cat "$__object/parameter/synapse-smtp-user")
 synapse_smtp_password=$(cat "$__object/parameter/synapse-smtp-password")
@@ -59,7 +65,19 @@ postgres_database='matrix-synapse'
 www_directory_owner=root
 nginx_basedir='/var/www/static'
 
-###
+##
+# Check for invalid parameter combinations.
+
+if [ -n "$element_domain" ] && [ -z "$element_version" ]; then
+	echo "--element-version is required if --element-domain is set." >&2
+	exit 1
+fi
+if [ -z "$element_domain" ] && [ -n "$element_version" ]; then
+	echo "--element-domain is required if --element-version is set." >&2
+	exit 1
+fi
+
+##
 # Deployment logic.
 
 # Install & configure PGSQL database.
@@ -84,6 +102,7 @@ __matrix_synapse \
 	--database-user "$postgres_user" \
 	--database-host '/var/run/postgresql' \
 	--enable-notifications \
+	--notification-from "Matrix <$synapse_smtp_user>" \
 	--smtp-host "$SMTP_SERVER" \
 	--smtp-port "$SMTP_SERVER_PORT" \
 	--smtp-use-starttls \
@@ -91,20 +110,6 @@ __matrix_synapse \
 	--smtp-pass "$synapse_smtp_password" \
 	$synapse_extra_parameters
 
-# Install & configure Element (matrix web client).
-# shellcheck disable=SC2086
-__matrix_element ungleich \
-	--install_dir "$nginx_basedir/$www_directory_owner/$element_domain/www" \
-	--default_server_url "$synapse_base_url" \
-	--default_server_name "$matrix_domain" \
-	--owner "$www_directory_owner" \
-	--version "$element_version" \
-	--jitsi_domain "$JITSI_DOMAIN" \
-	--privacy_policy_url "$PRIVACY_POLICY_URL" \
-	--disable_custom_urls \
-	--branding_auth_footer_links [] \
-	$element_extra_parameters
-
 # Install and configure NGINX web server/proxy.
 __package nginx
 
@@ -152,7 +157,7 @@ require="__matrix_synapse __package/nginx" \
 # clients if matrix_domain is element_domain (= both are handled by this
 # type).
 element_nginx_config=
-if [ "${element_domain:?}" = "${matrix_domain:?}" ]; then
+if [ "$element_domain" = "${matrix_domain:?}" ]; then
 	element_nginx_config="$(cat <<- EOF
 	location = /.well-known/matrix/server {
 		default_type application/json;
@@ -175,9 +180,25 @@ if [ "${element_domain:?}" = "${matrix_domain:?}" ]; then
 	)"
 fi
 
-require="__package/nginx" \
-	__ungleich_nginx_static_site "$element_domain" \
-	--owner "$www_directory_owner" \
-	--listen '443 [::]:443' \
-	--base_directory "$nginx_basedir" \
-	--locationopt "$element_nginx_config"
+if [ -n "$deploy_element" ]; then
+	# Install & configure Element (matrix web client).
+	# shellcheck disable=SC2086
+	__matrix_element ungleich \
+		--install_dir "$nginx_basedir/$www_directory_owner/$element_domain/www" \
+		--default_server_url "$synapse_base_url" \
+		--default_server_name "$matrix_domain" \
+		--owner "$www_directory_owner" \
+		--version "$element_version" \
+		--jitsi_domain "$JITSI_DOMAIN" \
+		--privacy_policy_url "$PRIVACY_POLICY_URL" \
+		--disable_custom_urls \
+		--branding_auth_footer_links [] \
+		$element_extra_parameters
+
+	require="__package/nginx" \
+		__ungleich_nginx_static_site "$element_domain" \
+		--owner "$www_directory_owner" \
+		--listen '443 [::]:443' \
+		--base_directory "$nginx_basedir" \
+		--locationopt "$element_nginx_config"
+fi
diff --git a/type/__ungleich_matrix/parameter/optional b/type/__ungleich_matrix/parameter/optional
index 9307d6a..1adc62c 100644
--- a/type/__ungleich_matrix/parameter/optional
+++ b/type/__ungleich_matrix/parameter/optional
@@ -1,2 +1,4 @@
+element-domain
+element-version
 synapse-extra-parameters
 element-extra-parameters
diff --git a/type/__ungleich_matrix/parameter/required b/type/__ungleich_matrix/parameter/required
index 5000d5f..9a374a3 100644
--- a/type/__ungleich_matrix/parameter/required
+++ b/type/__ungleich_matrix/parameter/required
@@ -1,6 +1,4 @@
 matrix-domain
-element-domain
 synapse-domain
-element-version
 synapse-smtp-user
 synapse-smtp-password