Hi!
We have some serious outgoing Email issue since last night. Emails are filling up the SMTP spool, but are eventually delivered at some point in time.
Setup: internal Exchange who sends Email to UTM SMTP Proxy. The Proxy is utilizing our ISP's Smarthost. The configuration wasn't changed and worked flawless for months and years.
Since 2100 last night, new Emails are not being send out:
2019:07:11-13:00:30 mail exim-out[11284]: 2019-07-11 13:00:30 1hlWLY-0008Ft-4A == recipient@external.address R=smarthost_route T=smarthost_smtp defer (-46): SMTP error from remote mail server after end of data: host wp12950791.mailout.server-he.de [80.237.133.229]: 421 wp460.webpack.hosteurope.de SMTP incoming data timeout - closing connection.
From that point onwards, the Email is sitting in the spool:
2019:07:11-13:00:48 mail exim-out[13341]: 2019-07-11 13:00:48 1hlWLY-0008Ft-4A == recipient@external.address R=smarthost_route T=smarthost_smtp defer (-53): retry time not reached for any host
In regards to the retry time message, I followed the guidance in some other threads and flushed the DNS cache + restarted the UTM. But the problem persists.
What can be the problem? I currently have no clue how to fix it, but have a lot of users calling me up. :-/
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