hash:/etc/postfix/relayhost_map lookup error

Discussion in 'Server Operation' started by adamjedgar, Oct 3, 2017.

  1. adamjedgar

    adamjedgar Member

    server3 postfix/trivial-rewrite[15407]: warning: hash:/etc/postfix/relayhost_map lookup error for "[email protected]<mydomain>.com.au"
    server3 postfix/trivial-rewrite[15407]: warning: sender_dependent_relayhost_maps lookup failure
    server3 postfix/error[17434]: B62708488F: to=<[email protected]>, relay=none, delay=0.24, delays=0.2/0.02/0/0.02, dsn=4.3.0, status=deferred (address resolver failure)

    My assumption is that i need to create a relayhost_map in /etc/postfix/ ,however, i am not sure what goes into this file? (actually i am not sure whether i am supposed to create a file, or whether its supposed to happen automatically when i edit the postfix/master.cf)
  2. florian030

    florian030 ISPConfig Developer ISPConfig Developer

  3. adamjedgar

    adamjedgar Member

    I have figured out what the problem is...i followed these two tutorials
    1. https://sendgrid.com/docs/Integrate/Mail_Servers/postfix.html
    2. https://cloud.google.com/compute/docs/tutorials/sending-mail/using-sendgrid

    Both tutorials do not mention that the following line (if it exists) in /etc/postfix/main.cf must be commented out or deleted,
    • #sender_dependent_relayhost_maps = hash:/etc/postfix/relayhost_map
    commenting that line out solved my problem immediately.

    What i now would like to know is what that line i have commented out is supposed to actually do. Will me having removed it cause any other problems?
    Last edited: Oct 3, 2017

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