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Brute force on mailer-daemon@domain?

Discussion in 'E-mail Discussion' started by Markif, May 20, 2018.

  1. Markif

    Markif Member

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    Hello,
    I see in /var/log/maillog repeating IMAP attempts to the "mailer-daemon" user of a domain.
    Is this something to worry about,
    or is this just a robot making errors...
    example

    Code:
    -----
    May 19 03:40:09 is30 dovecot: imap-login: Disconnected (auth failed, 1 attempts in 14 secs): user=<mailer-daemon@***>, method=PLAIN, rip=***, lip=***, TLS, session=<8GJEJYVssQQFvAmR>
    May 19 03:40:24 is30 dovecot: imap-login: Disconnected (auth failed, 1 attempts in 14 secs): user=<mailer-daemon@***>, method=PLAIN, rip=***, lip=***, TLS, session=<kZ4rJoVsgEtcP8E3>
    -----
    
    Thanks,
    Marco
     
    #1 Markif, May 20, 2018
    Last edited by a moderator: May 20, 2018
  2. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello Marco,

    It looks like a failed login attempt that you can safely ignore. Can you verify if the IP addresses you removed from the log output are remote or local IP addresses?

    Thank you.
     
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  3. Markif

    Markif Member

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    Hello,

    rip is a always changing remote IP, lip is the server IP

    Thank you,
    Marco
     
  4. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello Marco,

    In that case, it's just showing you a failed authentication attempt with that username from that IP address. You could block the IP address in your firewall if you'd like to prevent it from making additional authentication attempts.

    Thank you.
     
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