Our Sophos UTM 220 is running SMTP anti-spam proxy, and has been running well for many months. After the recent firmware update to 9.351-3 the SMTP proxy frequently stops delivering mail.
Messages are logged as moving to the work queue, but exim-out never actually picks up the messages and spools them for delivery. To clear the stuck mail I have to stop SMTPD, clear the retry timeout database, and restart SMTPD.
We are only using this for inbound filtering, and it's delivering to our in-house SMTP server, nothing very complicated.
exim-out ends with a simple message:
2015:11:23-10:31:15 firewall exim-out[29473]: 2015-11-23 10:31:15 End queue run: pid=29473
But the "start queue run" message doesn't reappear until after I restart the SMTP service. Obviously I can't babysit this thing all day. Any ideas?
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