Thanks for your reply. We don't use ipsec here. I do appreciate the reply though. Also, I can get email from them. Just can't send anything??? -----Original Message----- From: Tony Anderson [mailto:tandersn@xxxxxxxxxxxxxxxxx] Sent: Tuesday, March 16, 2004 1:49 PM To: [ExchangeList] Subject: [exchangelist] Re: Problem sending to one domain http://www.MSExchange.org/ I had a problem where I installed IPsec on my exchange server. Then, as a result, my exchange server couldn't talk to other SMTP servers that were behind certain types of firewalls. Messages were not delivered to those servers. Tony ----- Original Message ----- From: "seabass" <denisedorrance@xxxxxxxxxxx> To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx> Sent: Tuesday, March 16, 2004 10:51 AM Subject: [exchangelist] Problem sending to one domain > http://www.MSExchange.org/ > > I'm having problems sending emails to one specific domain (multiple > users sending emails and they are returned). I have checked my > Exchange server 5.5 and there are no blocked addresses in there > besides the default local host. I have also checked my firewall and > do not see them blocked. The error on return is as follows: > > The recipient was unavailable to take delivery of the message The > MTS-ID of the original message is: c=US;a= ;p=My > Company;l=EXCHANGE-040315161041Z-44509 MSEXCH:IMS:My Company:My > Company:EXCHANGE 3499 (000B09AA) Host unreachable > > Thanks!! > > ------------------------------------------------------ > 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 > ------------------------------------------------------ > ------------------------------------------------------ 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 ------------------------------------------------------