I installed once my home server new, with postfix as satelite system and got always one error. While sending mails with attachment the log file show following error:

delivery temporarily suspended:
lost connection with  while receiving the initial server greeting

The reason was my mistake. I didn’t see, that inet_interfaces was set to loopback-only.
The error arise also, when you set inet_interfaces or smtp_bind_address to a specific IP and using amavis. In case you need a specific IP, add also the loopback for amavis.

inet_interfaces = 87.20.126.55, 127.0.0.1

The second problem occures when using TLS with selfsignt certificate on mail server. No Idea why but I get always an error.

warning: network_biopair_interop: error writing  bytes to the network: Broken pipe

At the next line in mail log, you get mail status=deferred cause of timeout. My only solution was to disable TLS or buy a certificate.

Hope that help others.

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