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Outbound messages not working in Exchange 2010 - Inbound OK. PTR issue. Need Help

Posted on 2011-02-18
Medium Priority
Last Modified: 2012-06-27
Outbound messages not working in Exchange 2010 - Inbound OK. PTR issue. Need Help. I can receive  but not send. PORT 25 is open. Old mail server was working up unitl 5 PM. Changed DNS on Network Solutions to new external IP. PTR record issue I see talked about but not sure where and how to add this. ISP?
Question by:smartini67
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LVL 58

Expert Comment

ID: 34930940

The ISP would usually maintain control for your PTR record (if you managed it, you would know about it) -- so whoever you lease the static IP address from needs to update the PTR record for that address to whatever your mail server is known as on the Internet.

Essentially, when it comes down to PTR records, the name in the PTR needs to match the server name passed when your server announces itself to other mail servers to deliver email. This is the value set on the first page of your Send Connector.

So if that value is and your server sends email from public IP, you must ensure that the PTR on (the full name of the record will be is That should resolve your issues, but bear in mind DNS changes can take some time to propagate around the Internet, particularly considering the Time-to-Live on the current PTR record (the time before it expires from global DNS servers caching the result) is probably set fairly high.


Author Comment

ID: 34931021
Well I have had other clients have SOME sending problems based on PTR but never NO sending issues. Maybe something else. My DNS? Any ideas?
LVL 58

Expert Comment

ID: 34932572

It depends who you are sending to, and what sort of checks they are doing on these types of settings. The uptake of checks such as SPF and DNS PTR records has increased dramatically over recent years as people try to secure SMTP and combat the unfortunate spread of spam mailings.

When you say outbound email doesn't work, how do you know? Do you get an NDR back? If so, what's the message in the NDR?

At this point in time you'd also be well versed to do an test too, to make sure you aren't on any blacklists.


Author Comment

ID: 34952070
Everything is now flowing EXCEPT message to AOL.COM mail receipients. This the only domain affected now. MXTOOLBOX show no blacklist.
LVL 58

Accepted Solution

tigermatt earned 2000 total points
ID: 34952135

AOL are renowned for being strange and unusually strict in their delivery of email.

I'd suggest you check your AOL IP reputation here:

You will need to contact them directly to have your IP address removed from their own blocklist, or even if it isn't listed, get added to their whitelist:


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