Something similar happened to us recently (with Exch 5.5 Sp4). May be a routing issue but strangely enough, here's what helped in my case after exhausting other possibilities. Double-check your IMC queue in Exchange Admin to be sure those messages aren't there. If you don't see anything in there, go into the \EXCHSRVR\IMCDATA\ OUT folders and check to see if the mail is sitting in there. (My guess is that's where it is). If so, stop both the MTA and IMC services and then restart. Check to see if this flushes the mail out. Good luck. -----Original Message----- From: jibarra@xxxxxxxxxxx [mailto:jibarra@xxxxxxxxxxx] Sent: Wednesday, April 17, 2002 2:04 PM To: [ExchangeList] Subject: [exchangelist] Help 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: wlevine@xxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')