postfix/smtp: fatal: unknown service: smtp/tcp

Solution Verified - Updated -

Issue

postfix/smtp[24756]: fatal: unknown service: smtp/tcp
postfix/qmgr[11099]: warning: private/smtp socket: malformed response
postfix/qmgr[11099]: warning: transport smtp failure -- see a previous warning/fatal/panic logfile record for the problem description
postfix/master[11097]: warning: process /usr/libexec/postfix/smtp pid 24756 exit status 1 status=deferred (unknown mail transport error)

Environment

  • RedHat Enterprise Linux
  • Postfix

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