diff --git a/mail-server/dovecot.nix b/mail-server/dovecot.nix
index fed2189..686c390 100644
--- a/mail-server/dovecot.nix
+++ b/mail-server/dovecot.nix
@@ -106,6 +106,9 @@ in
           }
         }
 
+        recipient_delimiter = +
+        lmtp_save_to_detail_mailbox = yes
+
         protocol lmtp {
           mail_plugins = $mail_plugins sieve
         }
diff --git a/mail-server/postfix.nix b/mail-server/postfix.nix
index 31c9b61..06c6af0 100644
--- a/mail-server/postfix.nix
+++ b/mail-server/postfix.nix
@@ -134,7 +134,7 @@ in
       ''
         # Extra Config
         mydestination =
-
+        recipient_delimiter = +
         smtpd_banner = ${fqdn} ESMTP NO UCE
         disable_vrfy_command = yes
         message_size_limit = ${builtins.toString cfg.messageSizeLimit}