You also need administrator access and permissions to execute the commands and steps discussed below. Hence, good know-how of the Exchange server processes is essential. However, you may require considerable technical expertise to execute the steps. How to Fix Exchange SMTP Error 550 5.7.1 'Unable to Relay'?īelow we have provided a few manual solutions to fix Exchange Error 550 5.7.1. Most commonly, the reason could be database corruption or the nonexistence of a specific Recipient's policy for the particular domain in the user's department in the Exchange server database(s) that results in this error message. Sending an email to a large distribution group.
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