Mail warning: hostname verfication failed

Discussion in 'Installation/Configuration' started by Dima_2005, Nov 4, 2011.

  1. Dima_2005

    Dima_2005 New Member


    In my log I see a lot of warnings like this:
    Nov 4 11:42:28 backupserver postfix/smtpd[22340]: warning: hostname verification failed: Name or service not known
    What does it mean? Are those mails sent or did it fail? How to avoid these warnings?

  2. falko

    falko Super Moderator ISPConfig Developer

    Do you have valid nameservers in /etc/resolv.conf?
  3. Dima_2005

    Dima_2005 New Member

    I do,

    my resolv.conf:
  4. falko

    falko Super Moderator ISPConfig Developer

    Is this one of your servers or a remote system?
  5. Dima_2005

    Dima_2005 New Member

    it's a remote system. I think it's one of the emails that were sent... and this warning was present after sending the mail

    EDIT: i think i found the problem. It's probably some spam-servers which try to send mail through my server ip. I've looked up some recent warning hostnames and found that most of them are actual spam IP's.
    Although I have to say that it's a weird error for something like this, but ok.
    Last edited: Nov 6, 2011

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