can you ping their Internet Router? new backbone on your end? Sounds like a routing issue to me.... >>> jibarra@xxxxxxxxxxx 04/17/02 11:03AM >>> http://www.MSExchange.org/ Hi all, I have a situation where my users can't send email to this particular domain. I ma running X5.5 on windows 2000 server. Whenever we send an email to xx@xxxxxxx <mailto:xx@xxxxxxx> the email goes out, leaves our server, but it never reaches the recipient nor we get an NDR. Please help. Juan ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: elanyon@xxxxxxx To unsubscribe send a blank email to leave-exchangelist-668870R@xxxxxxxxxxxxx