How to configure sendmail for relaying mails to relay server using authentication ?

Solution Verified - Updated -

Issue

  • While sending mail to user through relay, authentication is failing to relay server.
# sendmail -Am -v -t
To: user@domain.com
from:localhost@localhost
Subject:test

>>> MAIL From:<user@hostname> SIZE=66
530-5.7.0 Authentication Required. Learn more at
530 5.7.0  https://support.google.com/mail/?p=WantAuthError iv6-20020a05600c548600b003a5f54e3bbbsm2750693wmb.38 - gsmtp
  • How to configure sendmail client which can relay mails to relay server with authentication ?

Environment

  • Red Hat Enterprise Linux 8

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