diff --git a/.env.dist b/.env.dist
index add937bd..d365eb75 100644
--- a/.env.dist
+++ b/.env.dist
@@ -73,6 +73,10 @@ RELAYHOST=
 # Fetchmail delay
 FETCHMAIL_DELAY=600
 
+# Recipient delimiter, character used to delimiter localpart from custom address part
+# e.g. localpart+custom@domain;tld
+RECIPIENT_DELIMITER=+
+
 ###################################
 # Nginx settings
 ###################################
diff --git a/dovecot/conf/dovecot.conf b/dovecot/conf/dovecot.conf
index 0f4b04d8..928b4d3e 100644
--- a/dovecot/conf/dovecot.conf
+++ b/dovecot/conf/dovecot.conf
@@ -127,7 +127,7 @@ service imap-login {
 
 protocol lmtp {
   mail_plugins = $mail_plugins sieve
-  recipient_delimiter = +
+  recipient_delimiter = {{ RECIPIENT_DELIMITER }}
 }
 
 service lmtp {
diff --git a/postfix/conf/main.cf b/postfix/conf/main.cf
index 6cd514e8..b806a46f 100644
--- a/postfix/conf/main.cf
+++ b/postfix/conf/main.cf
@@ -28,6 +28,9 @@ mydestination =
 # Relayhost if any is configured
 relayhost = {{ RELAYHOST }}
 
+# Recipient delimiter for extended addresses
+recipient_delimiter = {{ RECIPIENT_DELIMITER }}
+
 ###############
 # TLS
 ###############