DNS: Mail Issues

For some reason, lately a certain email address cannot recieve any emails from outside addresses, however, it can recieve from an email addy on the same server.

I performed a test from DNS report, and got the following error:

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).

[domain name] claims to be non-existent host [hostname]:

Im not too sure how to go about fixing this, the dns records are identical to all the other domains on the server, and they all work, apart from this one.

 

 

 

 

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