postfix: add X-Original-To header per default (#6110)

data/conf/postfix/main.cf

@@ -170,6 +170,8 @@ smtputf8_enable = no
 submission_smtpd_tls_mandatory_protocols = >=TLSv1.2
 smtps_smtpd_tls_mandatory_protocols = >=TLSv1.2
 parent_domain_matches_subdomains = debug_peer_list,fast_flush_domains,mynetworks,qmqpd_authorized_clients
+# This Option is added to correctly set the X-Original-To Header when mails are send to lmtp (dovecot)
+lmtp_destination_recipient_limit=1
 
 # DO NOT EDIT ANYTHING BELOW #
 # Overrides #

data/conf/postfix/master.cf

@@ -105,7 +105,7 @@ retry      unix  -       -       n       -       -       error
 discard    unix  -       -       n       -       -       discard
 local      unix  -       n       n       -       -       local
 virtual    unix  -       n       n       -       -       virtual
-lmtp       unix  -       -       n       -       -       lmtp
+lmtp       unix  -       -       n       -       -       lmtp flags=O
 anvil      unix  -       -       n       -       1       anvil
 scache     unix  -       -       n       -       1       scache
 maildrop   unix  -       n       n       -       -       pipe flags=DRhu