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How to block smtp_auth hackers what are targeting a specific account?

Discussion in 'Plesk 9.x for Linux Issues, Fixes, How-To' started by eugenevdm, Apr 2, 2011.

  1. eugenevdm

    eugenevdm Silver Pleskian

    Nov 11, 2003
    Likes Received:
    I get this in my Qmail log files:

    tail -f /usr/local/psa/var/log/maillog | egrep -i "unable|failed|refused|error|warning|listed"

    This repeats over and over from all different IP address. At some stage the compromised user's password was changed so the spammers can't get back into that account.

    However, I want to take additional precaution and permanently block those IP addresses. Please recommend something that checks for repeated failed logins on SMTP and then block the IP addresses.