One of our clients have installed an ani-spam software which is blocking our legitimate email. Their IT guy has sent the below information suggesting why it might be refusing connections from our server.
WARNING: R[5] Connection rejected - Deny Connection for ns0.myserver.com [217.xxx.xx.xxx] (PTR record does not match HELO/EHLO string)
Just laugh at this one. There are occasionally people who run silly anti-spam programs that do silly things. There is no need for the PTR record to match the HELO/EHLO. Tell them that if they want your mail, they should stop rejecting it.
Also, would it be correct (as per RFC/SMTP standards) for our email to be blocked because EHLO response does not match DNS lookup or is it just a very strict rule for blocking spam.
It is perfectly RFC-compliant to have an EHLO that does not match the reverse DNS (just so long as the hostname in the EHLO resolves to the IP of the server, and the hostname in the reverse DNS entry resolves to the IP of the server).
But some people are getting so paranoid about spam that they block legitimate mail that comes from servers that are RFC-compliant and aren't doing anything bad.
-Scott
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