Hi,
I've noticed in my logs - very occasionally Cyrus isn't excepting
messages...
The front end MX host accepts the mail, passes it onto the back end IMAP
server - but this logs:
sm-mta[41247]: yyyyyyyyyyy: localhost: SMTP DATA-3 protocol error: 530
5.3.0 <auser> Fatal: 550-Mailbox unknown. Either there is no mailbox
associated with this
While trying to deliver it to the imap inbox (via LMTP etc.)
I've also seen:
sm-mta[70586]: zzzzzzzzzz: localhost: SMTP DATA-3 protocol error: 530 5.3.0
<buser> Fatal: 501 5.5.4 Syntax error in parameters
Any idea how I can try and debug this? - From / To Address combinations
that deliver fine, will then randomly fail at some future point.
Checking this month the server has rejected 4 out of over 10,000 accepted
messages. Annoyingly they're a hard 5xx fail (so it goes back to the
sender).
This is on FreeBSD 10.3.
-Karl
