Sendmail error

Discussion in 'HOWTO-Related Questions' started by rashid, Sep 15, 2011.

  1. rashid

    rashid New Member

    Dear all

    When i am using (static / live ip with dns) sendmail perfectly working.

    when i am using adsl modem with local ip and local dns sendmail giving error

    Deferred: Name server: host name lookup failure

    Any Idea

    Rashid Khan
  2. falko

    falko Super Moderator ISPConfig Developer

    First thing, if you are on a dynamic IP, this IP is most likely blacklisted, and you should set up relaying - for Postfix this can be done as follows:

    Second thing: do you have valid nameservers in /etc/resolv.conf? Can you try Google's nameservers ( and instead?

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