Error '553 5.5.4 <>... Domain name required for sender address ...remote is not'

Solution Unverified - Updated -

Issue

  • While sending mail from outside to non-existent user, instead of giving bounce back error message to sender, outgoing sendmail server is sending following error
    553 5.5.4 <>... Domain name required for sender address ...remote is not

Environment

  • Red Hat Enterprise Linux 5
  • Sendmail

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