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HOW TO FIX EXCHANGE ERROR: 504 5.5.2 HELO COMMAND REJECTED: NEED FULLY-QUALIFIED HOSTNAME

If you send an email and receive the following undeliverable “Delivery Final Failure Notice” with the following information:

Reply from x.x.x.x: 504 5.5.2 <servername>: Helo command rejected: need fully-qualified hostname

Then follow this steps to resolve:

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