Hi Qusai, Are you using any kind of router. If so, the MTU needs to be 1492 bytes or greater for your mail to go out. If not, it's going to stay there, and won't deliver your messages. I hope this help. Mariano "Qusai A. AL Haddad" <qusai@xxxxxxxxxxxxxx> wrote: http://www.MSExchange.org/ Dear All I have Exchange 2003 and it was working fine this morning .. Iti s configured for POP and SMTP client Now I can't send email to outside domains... but I can receive from them .. I get this error msg when I send outside Your message did not reach some or all of the intended recipients. Subject: Sent: 10/19/2003 8:12 PM The following recipient(s) could not be reached: 'username@xxxxxxxxxx' on 10/19/2003 8:12 PM 550 5.7.1 Unable to relay for username@xxxxxxxxxx I check the relay option in SMTP virtual server and every things seems ok. Any help will be appreciated Qusai A. AL Haddad ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ --------------------------------- Do you Yahoo!? The New Yahoo! Shopping - with improved product search