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Mail Error '550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found'

If you are sending mail it can occur that you receive an error as displayed below:

Example user (cloudnetdemo)
Het door u ingevoerde e-mailadres is niet gevonden. Controleer het e-mailadres van de geadresseerde en probeer het bericht opnieuw te verzenden. Als het probleem blijft bestaan, neemt u contact op met de helpdesk.

Diagnostische gegevens voor beheerders:


Remote Server returned '550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found'

This error is usually caused by faulty autocomplete contacts within Microsoft Outlook. Please follow the following Microsoft Support article:

If the problem still exists after working through the Microsoft Support Article please contact support (link). When creating a ticket include the NDR (Non-Delivery Receipt) message from our servers.

JavaScript errors detected

Please note, these errors can depend on your browser setup.

If this problem persists, please contact our support.