You're running a PIX firewall, take a look at this link and disable the MailGuard feature: http://support.microsoft.com/default.aspx?scid=kb;en-us;320027 Mark Fugatt MCSE, MCT, Microsoft Exchange MVP Pentech Office Solutions Inc Rochester, NY Tel: 585 576 4750 http://www.4mcts.com <http://www.4mcts.com/> http://www.exchangetrainer.com <http://www.exchangetrainer.com/> _____ From: Shawn Moua [mailto:smoua@xxxxxxxxxxxxxxx] Sent: Tuesday, December 30, 2003 1:39 PM To: [ExchangeList] Subject: [exchangelist] Exchange 2003 http://www.MSExchange.org/ I am trying to configure a clustered Exchange 2003 setup. Internally, everything works fine as well as outgoing external email. However, I cannot get incoming external emails. Any clues? Thanks, Shawn. ------------------------------------------------------ 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 ------------------------------------------------------