Postfix 451 4.3.0 Temporary lookup failure

You set up Postfix and attempt to send the mail, but receive an error saying “451 4.3.0 Temporary lookup failure”.

Check to see if you have /etc/postfix/transport file. If you don’t, run the command below and try again:

  • cd /etc/postfix
  • touch transport
  • postmap transport
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