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Error: 'Unknown address error 550-'5.7.1 Recipient rejected (R4)' when message is rejected

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Information

 
Answer

PROBLEM

A message is rejected with the following error:
 
Unknown address error 550-'5.7.1 Recipient rejected (R4)'

SOLUTION

  1. Add the user/aliases affected by this to the User List 
    • Found under Management tab > User Management
  2. Change the Unknown Users setting 
  • Found under Management > Inbound Filtering > Spam Handling Settings > Unknown Users
    • Note: BLOCKED is the recommended option

CAUSE

When Unknown Users is set to block and the user is not listed in the Control Panel, then email to that user is rejected.

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