diff --git a/ungleich-mail/README.org b/ungleich-mail/README.org
index 6bf7e29..9d1cfad 100644
--- a/ungleich-mail/README.org
+++ b/ungleich-mail/README.org
@@ -21,3 +21,6 @@
     Configure main.cf with "maillog_file = /dev/stdout".
 
     Start Postfix with "postfix start-fg".
+** TODO Check EAI support
+   - https://en.m.wikipedia.org/wiki/International_email
+   - https://www.icann.org/get-ua-ready-en