My UTM (9.3) is set up to use my own mail server (sitting on a VPS somewhere) to send email. I've got a user on the VPS to send with, as I need to auth to it to send (don't do open relaying).
I can connect and send fine using that user, and using STARTTLS on port 587 if I use Thunderbird. However, the UTM configured the same way fails miserably thus:
2015:02:27-23:01:56 router postfix/qmgr[28512]: 523004C20: from=, size=855, nrcpt=1 (queue active)
2015:02:27-23:01:56 router postfix/smtp[29022]: warning: SASL authentication failure: No worthy mechs found
2015:02:27-23:01:56 router postfix/smtp[29022]: 523004C20: to=, relay=server.mydomain.co.uk[x.y.z.a]:587, delay=1005, delays=1005/0.03/0.3/0, dsn=4.7.0, status=deferred (SASL authentication failed; cannot authenticate to server server.mydomain.co.uk[x.y.z.a]: no mechanism available)
Yes, it is a .co.uk and a .net - the .co.uk is my 'infrastructure' domain, the .net my real one.
I'm mystified what's going on here. Postfix on the server just records the UTM connecting and disconnecting, so it suggests it's connecting to the server, not seeing something it likes, and connecting again, but I've zero clue what. I've got UTMs at work connecting to Exchange and boshing out emails without issue, so I'm a little confused here!
Anybody have any bright ideas?
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