Rolf wrote: > LMTP would be new to me and I fear just other hard-to-understand > configuration topics.
LMTP (Lightweight Message Transfer Protocol) is really simple, similar to SMTP, but immediately returns a status code which tells whether the delivery has been successful or not. I encourage you to read this HOWTO: http://wiki2.dovecot.org/HowTo/PostfixDovecotLMTP Dovecot listens and accepts mails on the LMTP service port, postfix delivers mails directly into this LMTP service port. Since it is an additional service, you should be able to try it first, without interfering with your deliver functionality. Here you can read, how the LMTP communication looks like: http://de.wikipedia.org/wiki/LMTP Regards Daniel -- https://plus.google.com/103021802792276734820