SASL LOGIN authentication failed

Discussion in 'Server Operation' started by pecka33, Apr 3, 2020.

  1. pecka33

    pecka33 Member


    in my ISP panel in email warning I can see information like

    warning: unknown[]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

    So i guess that means someone tried to login to mail server? I am using Fail2Ban too, try change this in

    But still i can see this logs. What is the best solution here? Maybe i should change something in postfix settings?
  2. pecka33

    pecka33 Member

    In final maybe this little solve this problem. I try to chceck fail2ban log and from time of change a can see there a few records as
    2020-04-03 22:24:46,408 fail2ban.filter [1029]: INFO [postfix-sasl] Found
    2020-04-03 22:25:10,343 fail2ban.filter [1029]: INFO [postfix-sasl] Found

    Just about 7. Other records looks like

    2020-04-03 21:56:19,642 fail2ban.filter [1029]: INFO [sshd] Found

    EDIT. Final i can see more attemps with same error, but maybe less then before. If someone have any idea, i will be happy :) Thats just warning, not fatal error, so this is not so important i hope.
    Last edited: Apr 3, 2020
  3. Taleman

    Taleman Well-Known Member HowtoForge Supporter

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