Recommendations on intrusion prevention/detection?

[Johannes Rohr]

Dear all,

what are the key strategies for intrusion prevention and detection with
dovecot, apart from installing fail2ban?
It is a pity that the IMAP protocol does not support 2 factor
authentication, which seems to stop 90% of intrusion attempts in their
tracks. Without it, if someone has obtained your password and reads your
mail without modifying it, you will hardly ever notice.

Is there a reasonable way of detecting and preventing logins from
unusual IP ranges? Or are there other strategies you would recommend?

Cheers,

Johannes


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