Dear All, Please help meoutin this matter , I am using W2K server and exchange 5.5 with SP4 , every thing is working fine , All the user are sending mails and receiving them back , But if any client try to send mail through OWA the mail return with this error which i have given below. The clients are receiving mails but can;t send it to foreign domain . please help me out in this matter , this is very urgent . Your message did not reach some or all of the intended recipients. To: 'basit14@xxxxxxxxxxx' Subject: test mail fromabm on 4-9-03 Sent: 9/4/2003 11:38:16 AM The following recipient(s) could not be reached: 'basit14@xxxxxxxxxxx' on 9/4/2003 11:40 AM Unable to deliver the message due to a recipient problem MSEXCH:MSExchangeIS:bayerdas:BAYERDASRegardsA.Basit