How TO Enable External SMTP in WHM

If you are setting up external SMTP like Google Workspace and are getting following error:

SMTP Debug: SMTP Error: Could not authenticate.​

Then you need to do some tweaks inside WHM.

  1. WHM > Tweak Settings > “Restrict outgoing SMTP to root, exim, and mailman (FKA SMTP Tweak)” (or through WHM > SMTP Restrictions)
  2. If server uses CSF then ensure that SMTP_BLOCK is disabled in the CSF configuration 
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