emails to aol and others not being sent using Windows 2003 server Exchange 2003

We installed a new Windows 2003 server, exchange 2003 server for our email.  Everything seems to be working fine, except the outgoing email messages to,, are not making it out and everything else is..Any thoughts what I can check, add to the server to get the messages sent?
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jrskeenConnect With a Mentor Commented:
Be sure your external reverse dns is resolving properly.  I had similar issues and that was my solution.  Just be sure your ISP can resolve your Mail Server by reverse lookup.  They need to set up an "A" record.  Good Luck.
rpone605Connect With a Mentor Commented:
aol and other sites do a reverse dns lookup when receiving email from outside sources.  you may want to find out if your isp is modifying the reverse dns and if they are correct it so it points to your exchange server.
I think that this may be a DNS problem. I had a similar issue where mail to yahoo wasn't being delivered (see if you can go to or not)

For me, the solution was this:
A potential Solution to your problem (if it is DNS/Reverse lookup or IP BlackList related) is to us a Smart Host.  

Just go into Exchange System Manager, Expand the Folders for Server / (Server Name) / Protocols / SMTP then right click the Default SMTP Virtual Server and choose properties.

Click Delivery then Advanced...  Put the name of your ISP's SMTP server in the "Smart Host" box.

"If you type the FQDN of a smart host, all outgoing e-mail messages will be relayed through the smart host."

As long as your ISP (or whatever SMTP server you use) is not on a Blacklist and has a Name for it's IP defined in DNS you are set.

I mention this as some ISP's wont setup or change DNS unless you pay for a static IP and many people don't want that expense, also it is possible that at one point you were listed as an open relay or blacklisted.

Also may want to check and see if your IP is listed.

Good Luck!

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