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email: dovecot: Add fail2ban jail

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I tested this patch on a production server. When trying to authenticate with
Thunderbird, the program will try to log in three times, then disconnect from
the server. This means that one failed login attempt will be logged as four
attempts. For this reason, set maxretry to be 30.

The IP block only affects dovecot, other services are still reachable.

Signed-off-by: nbenedek <contact@nbenedek.me>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>
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nbenedek 2022-11-17 20:17:10 +01:00 committed by Sunil Mohan Adapa
parent 5cfdf13491
commit c1129be4e7
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plinth/modules/email/data/etc/fail2ban/jail.d/dovecot-freedombox.conf Normal file
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[dovecot]
enabled = true
maxretry = 30