Hi I have put this question out before but I have some updates. The question is I am having the problem that some domains are not excepting emails from us. Exchange tries and after 2 hours fails and sends a message back to the user saying that it was undeliverable. Mostly this is happening with yahoo.com but also other domains. We did have a reverse dns problem but that is all fix including our ptr record so people should now be able to do reverse dns. Now what?? I still have the problem. Any ideas???????? Thanks Dale