Configure Fail2ban to block SASL login failed attempts in Postfix

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Ref - https://bobcares.com/blog/fail2ban-postfix-sasl/

Add the following section in the jail.local file.

[sasl]
enabled  = true
port     = smtp
filter   = postfix-sasl
logpath  = /var/log/mail.log
maxretry = 5

We need to configure Fail2Ban filter for postfix authentication failures in /etc/fail2ban/filter.d/postfix-sasl.conf

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