just a couple more questions :) , does the IP address EHLO response resolves to and the IP reverse DNS entry resolves to need to be same? In our case, though both of them do resolve to IP addresses (same physical machine actually) they are 2 different IP's as we have configured our imail server on a different ip address.
Ah, that could be a problem.
A remote mailserver won't know that those 2 IPs are on the same server. If IMail connects to a remote mailserver to send mail, the only IP that the remote mailserver cares about is the IP that is connecting to it. The EHLO should be a hostname that resolves to that IP, and the reverse DNS entry for that IP should resolve to that IP as well.
So if the mailserver has both example.com/mail.example.com at 192.0.2.25 and example.net/mail.example.net at 192.0.2.26, if IMail connects to a remote mailserver using the IP 192.0.2.25, it should send "EHLO mail.example.com" (or "EHLO example.com", if there is an A record pointing to 192.0.2.25), not using a .net domain. Also, 192.0.2.25 should preferably resolve to "mail.example.com" -- but it could resolve to something else ("192-0-2-25.my_internet_provider.net", for example), if that hostname resolves back to 192.0.2.25.
Also, just in case the mail admin really needs us to match ehlo and reverse dns, would it be possible for us to do so. Would we need to change something in our DNS or our Imail settings?
The question is are you willing to spend time and effort to help someone else reduce their spam, just because they are using poor anti-spam control? If they want to be super aggressive and intentionally block a lot of legitimate E-mail, it is their responsibility to clean up the mess (in this case, whitelist you).
If you really want to get everything lined up so that it will meet this admin's needs (*WARNING* -- bending over backwards for one aggressive anti-spam program often breaks another one), you'll first need to list all the information about your server -- every IP, every domain, every host alias, the complete DNS (what every host name resolves to, all PTR records, etc.). Once you have that information, you can determine what may need to be changed.
-Scott
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