Getting "mail transport unavailable" error in Postfix.

Solution Verified - Updated -


  • After configuring /etc/postfix/transport file, getting following error while sending emails:
Jun  2 15:53:11 xxxx postfix/qmgr[20304]: warning: connect to transport private/????smtp: No such file or directory
Jun  2 15:53:11 xxxx postfix/error[20391]: 2500A80251: to=<>, relay=none, delay=0.06, delays=0.04/0.01/0/0.01, dsn=4.3.0, status=deferred (mail transport unavailable)


  • Red Hat Enterprise Linux 6
  • Postfix

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