Luke Do you have a Reverse DNS zone configured for your domain name? You might also want to check that the FQDN specified on your SMTP Virtual Server is the same as your MX record. Mark Fugatt MCSE, MCT, Microsoft Exchange MVP Pentech Office Solutions Inc Rochester, NY Tel: 585 586 3890 Cell: 585 576 4750 http://www.4mcts.com http://www.exchangetrainer.com -----Original Message----- From: luke levis [mailto:luke.levis@xxxxxxxxxx] Sent: Wednesday, August 11, 2004 11:47 AM To: [ExchangeList] Subject: [exchangelist] can't send to yahoo.com http://www.MSExchange.org/ we recently upgraded our network to active directory and are running windows 2003 server with Exchange server 2003 and for some reason now everytime someone tries to send to and addres @yahoo.com they get and NDR, and in our previous environment we had no restrictions on who you could send it to.. and I am about 2 weeks into using E2k3 so I might as well have a blind fold on.. any help is appreciated Luke ------------------------------------------------------ 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: World of Windows Networking: http://www.windowsnetworking.com 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 ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: mark@xxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx