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Good morning Experts!

We have a very frustrating and puzzling error occuring with our newly live Exchange 2007 server.
For the past week we've been receiving SPAM flagged bounce backs accompanied by the following DNS error:

WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). If your mailserver sends out E-mail using this domain in its EHLO or HELO, your E-mail might get blocked by anti-spam software. This is also a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server. Note that this one test may use a cached DNS record.

mail.snsautomation.com claims to be invalid hostname 'mercury'

In our Exchange setup, we have successfully set the Client MERCURY and Default MERCURY FQDN to mail.snsautomation.com.  Our pings have resolved to the correct IP address.  

What setting are we missing here?  It seems like a needle in a haystack.  If anyone could point us in the right direction, that would be great.
Thanks so much!

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Chris Dent

8/22/2022 - Mon