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PTR record

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by lhatcher

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I am setting up a new email server. I have a test domain setup with an mx record. I can send email to most domains, but when i try to send to aol my mail gets bounced, because i have not ptr record to do reverse dns. The ip address of the current domain we have is in the same ip block from our isp, and also has no ptr. We do have our mail filtered through postini, and the mx points to their server before ours. Could this explain why we can now send mail to aol? anyone have any other ideas? Any help would be great.

Thanks.

4 replies

by maniskid

Many ISP's will block ip's that dont have reverse DNS records for their mail servers. This is to prevent just anyone setting up a mail server and spamming. A good idea is to fire off an email to your local ISP and get them to set up the PTR record for your IP / mail server. This would probably get your ip off one of their exclusion listings

by lhatcher

Thanks for the reply. I rrealize that many isps block email with no ptr, but our current server can send to aol with no problem, it is in the same ip block, and has not ptr either. We have our email filtered through Postini, our mx actually points to them, so I was asking if that would be the reason why our current server isnt blocked by aol.

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