ERROR: "That domain isn't in my list of allowed rcpthosts" when trying to receive email on all mailboxes

If someone trying to send you email gets this error, simply disable and re-enable all affected mail accounts for the domain.

  1. Log in to Plesk
  2. Click on the problematic domain in the list at the bottom.
  3. Choose the "Mail" icon
  4. Click on the "Disable" lever icon at the top
  5. Click on the "Enable lever icon at the top

The problem should now be resolved!

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