When I've run into this problem it has typically come down to your MX records or internal DNS. I suspect the problem sites you're hitting perform a reverse lookup on all incoming, if they can't resolve a reverse DNS query they reject the message. If you're familiar with net monitor you can capture packets while sending to a problem domain, then inspect the packets for a "cannot resolve" type message from the problem domain. -----Original Message----- From: Woodrow H. Kroll [mailto:Wkroll@xxxxxxxxxx] Sent: Thursday, January 30, 2003 2:07 PM To: [ExchangeList] Subject: [exchangelist] rE: Test http://www.MSExchange.org/ I have a question for the group. I just recently reinstalled my DC (Wuch is my Exchange server) and installed Exchange 2000. My DNS is resolving correctly and I can surf to any site on the internet but when my Exchange server tried to send messages out to the internet it's not connecting to several sites. I cannot send email to MSN.com, Hotmail.come, Worldnet.att.com and a few others. I have sent messages to to other external domaines (Yahoo.com being one of them. Does anyone have any idea what could be causing this. My firewall setting have not changed at all and it was working when I had Exchange 5.5 running. Any and all help would be greatly apprecieated. Woody -----Original Message----- From: Administrator [mailto:Administrator@xxxxxxxxxxxxx] Sent: Thursday, January 30, 2003 1:59 PM To: [ExchangeList] Subject: [exchangelist] Test http://www.MSExchange.org/ Just making sure I'm still subscribed to this list as my ISP was down for a whole week and I had no email. Please reply back to let me know if you receive this msg Thanks, Matt http://www.RestonBoi.com:3500 <http://www.RestonBoi.com:3500> ------------------------------------------------------ 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 ------------------------------------------------------ ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: wkroll@xxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub') ------------------------------------------------------ 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 ------------------------------------------------------ ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: cmcnally@xxxxxxxxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')