Ok, I’ve had an email server up for about a year, and occasionally we have emails we send detected as spam. I did have the reverse dns pointer records setup from our ISP, but I am questioning if I am using the correct settings. I am suspicious that these servers which are flagging our email as spam could possibly be set to perform reverse dns lookups, and seeing that the domain tied to our IP doesn’t match.
We have a domain, lets just call it mydomain.com
We have a static public IP address, and behind that address are several servers to handle our website, VPN, email, etc…
The A record for that domain points to our public IP address.
We have to MX records, the lowest number (highest priority) points to a hosted email filtering service which does offisite filtering and then delivers to our mail server. the 2nd MX record points to mail.mydomain.com.
There is also an A record for mail.mydomain.com which points to our public IP address.
the email addresses are in the format user@mydomain.com
I have the reverse DNS pointer setup to point to mail.mydomain.com
Should this have been setup to point to mydomain.com instead?
We are not open relay.
That was one of the first things I did when I setup exchange.
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Admittedly, it’s been a while since I fooled around with DNS and mail servers, but I believe your current reverse DNS setting is correct.
I like the other poster’s suggestion about setting up an SPF record (http://old.openspf.org/dns.html), as it’s possible some spammers may have begun forging your domain causing ISPs to mark it as spam. With the SPF record, you can aid DNS in determining which hosts are legitimate mail servers for your domain. Some ISPs still may mark your mail as spam until they upgrade their own systems, but those who are already able to utilize the SPF record should immediately cease marking yours as spam (unless they’re using some other method, of course, like Bayesian filtering).
It sound like to me you have a OPEN RELAY, That is allowing unwanted guest to relay / forward "Spam" messages from your server. Here is a good like that will explain OPEN RELAY, http://web.archive.org/web/20070824005337/http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci782509,00.html
I am not sure what email software you are using but if you are using exchange and set it up with the default settings the relay will be open to allow anyone to send email from you server.
one more good link to look at on open relays:
http://www.mailsbroadcast.com/email.broadcast.faq/34.open.relay.email.faq.htm
Try setting up an SPF record. Also go to dsn stuff to run diagnostics on your domain’s dns