I discovered the same issue today, looks like I stopped receiving mail on Friday, April 1. amavis, antivirus, and antispam were not running. The steps above did not help me.
Incoming mail was failing with the following error:
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postfix/error[13647]: 09FC2ECF86: to=<admin@domain.tld>, relay=none, delay=0.07, delays=0.05/0/0/0.02, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]:10026: Connection refused)
I tried issuing
zmcontrol restart noticed the following error in the log:
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amavis[4389]: (!)_DIE: Suicide () TROUBLE in pre_loop_hook: config: no rules were found! Do you need to run 'sa-update'?
Running
sa-update failed with the following error:
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$ sa-update
error: no mirror data available for channel updates.spamassassin.org
channel 'updates.spamassassin.org': MIRRORED.BY file contents were missing, channel failed
The fix for me was to download MIRRORED.BY manually.
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# su - zimbra
$ cd /opt/zimbra/data/spamassassin/state/3.004005/updates_spamassassin_org/
$ wget http://spamassassin.apache.org/updates/MIRRORED.BY
$ sa-update
$ zmcontrol restart