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Securing Dovecot Email Server

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I'm running a LAMP VPS with AlmaLinux 8 and Apache, and I've installed a mail server using Postfix and Dovecot. Everything works fine for sending and receiving emails. However, I noticed that an intruder can establish a connection to Dovecot (e.g., using openssl s_client -connect mail.domain.com:993) and then brute force the username and password with unlimited attempts within the same live session.

Is there a configuration in Dovecot to terminate the current live session after 3 failed...

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