I've been getting a lot of NDR "Unable to relay" , not on all emails just some. We are running an Exch 2k box and Mail Essentials (on separate box) I set the virtual SMTP relay setting to "allow all computer which authenticate to relay" and added all my internal IP range. When I telnet into my mail essential server from the mail essential server every thing checks out but I'm still getting rejection. On the domain names that get reject I was able to get NSlookup to retrieve MX server name. Does anyone have any ideas what could be happening ? Thanks.... John Nguyen The preceding e-mail message (including any attachments) contains information that may be confidential or constitute non-public information. It is intended to be conveyed only to the designated recipient(s). If you are not an intended recipient of this message, please notify the sender by replying to this message and then delete it from your system. Use, dissemination, distribution, or reproduction of this message by unintended recipients is not authorized and may be unlawful.