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grep '123.123.123.123' /var/log/vesta/system.log
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2022-08-30 11:10:27 v-add-firewall-ban '123.123.123.123' 'servicename'
If you are interested to find a reason for this ban (if servicename = MAIL), in your SSH, as root, run:
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grep '123.123.123.123' /var/log/dovecot.log
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grep '123.123.123.123' /var/log/exim4/mainlog
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Aug 30 11:56:48 auth: Info: passwd-file([email protected],123.123.123.123): Password mismatch
How to check if some user has wrong password in mail client application - viewtopic.php?t=656