Question : Not able to send mail to AOL

I am not able to send mail to AOL.com mail IDs from my e-mail domains.
I am receiving the following errors
Diagnostic-Code: X-MTA; conversation with mailin-01.mx.aol.com[x.x.x.x]
    timed out while receiving the initial server greeting

Let me know why I am not able to send mail to AOL.
I tested the DNS test tool of AOL & the DNS reverse PTR is working fine.

Currently i changed my IP address of my SMTP server. After this the problem starte d to occur.
I also tested the manual test tool of the AOL & the reverse dns lookup.Everything is fine but still not able  to send mail to AOL.

Answer : Not able to send mail to AOL

OK, so now it is your choice.

You can

a) leave it off and all looks fine, or if you turn it back on again you need to find out the following:

b) Troubleshoot the CISCO :

1) Can you get a log of what the CISCO is doing, a log of the conversation, including AOL rejection and reason for rejection
2) Can you update it / firmware upgrade / has it been updated recently
3) Do you have any issues with the connection to the CISCO box
4) Can you double check that the IP of the CISCO device (which may be differnet to your Exchange server) IS 100% correctly formatted PTR as specified by AOL postmaster at http://postmaster.aol.com/info/rdns.html
5) 100% sure the CISCO IP IS NOT BLACKLISTED

I know what option I would choose!

Shaun