I have a client on MS Exchange 2000. All email in/out appears to be working fine except AOL. They can receive incoming AOL email, but when sending it out, it never gets to the recepient. Leaves the server and no bounce backs. They called AOL and AOL stated it was their exchange server. I am not having any other issues with any other domains. Not sure where or how to investigate this one. Any ideas? It doesn't appear that we have the issue. Thanks for any advice. LDB