Hello, occasionally I see in my log file, line like this:
Sep 13 13:35:35 imap postfix/lmtp[8943]: 75076AB380: to=<+ t...@testdomain.com>, relay=test.testdomain.com[/var/lib/imap/socket/lmtp], delay=3.6, delays=2.6/0.36/0/0.65, dsn=4.3.0, status=deferred (host test.testdomain.com[/var/lib/imap/socket/lmtp] said: 451 4.3.0 System I/O error (in reply to end of DATA command) We use postfix to deliver mail via LMTP to cyrus. I would like to future troubleshoot this issue and I don't know if the problem is in postfix or cyrus. Any thoughts?
