I host multiple domains and some customers are not able to use Craigs List because they are matching the senders from address to the reverse DNS response of the sending mail server. Since they don't match, mail is being rejected. Is there any way around this?
This has been discussed before, but I didn't see a solution:
I don't think that this solution answers the real problem here at all. We have this problem too and we have our SMTP server in Exchange configured properly. The problem is that when you have two domains "abc.com" and "2abc.com" and let's say "abc.com" is the main domian, and the DNS entry for the box matches "mail.abc.com" and the reverse IP lookup also matches that "mail.abc.com" then you decide to send a message out as "2abc.com", the domain that it is being sent from doesn't match the domain that you say you are "from" in your reply to etc. Some SPAM filters will see that this is a relay and will automatically block you from doing that. I don't think you can have 2 domains on a reverse IP lookup and/or perhaps that won't work properly all of the time.
The bottom line is for us we have 2 domains, one is our main company, and the 2nd is for our product. We send email for our product from our data center which is not in our company, and then we also do tech support, but have a help desk in our offices, so we also send out email for "2abc.com" on our exchange server, and sometimes we are being blocked because the reverse IP for that machine points to "abc.com" not "2abc.com"