To add to Al's information, true.... when you telnet to your mail server... which is on your LAN... using its public domain name.... and based on your network design.. most often the traffic would be routed out of your LAN and then back in again... making the firewalls think that it is a spoof attack and block the traffic. Instead do a simple telnet test from within the LAN... using the Local Private Host Name.. or the Priovate IP address.. this should tell you if your SMTP service is working fine in the first place. Syed Muqeemuddin Senior Network Administrator Saudi International Petrochemical Company Al-Khobar; Kingdom of Saudi Arabia Tel: +9663-358-9000 Extn-136 -----Original Message----- From: Mulnick, Al [mailto:Al.Mulnick@xxxxxxxxxx] Sent: Friday, December 12, 2003 5:45 PM To: [ExchangeList] Subject: [exchangelist] RE: delayed emails http://www.MSExchange.org/ If you're attempting to connect from a machine internal to the network (relative to the firewall) then it's likely not going to work. Many firewall configurations prohibit internal hosts from contacting external interfaces of the firewall for security reasons. Al -----Original Message----- From: Jen Mar [mailto:jmar@xxxxxxxxxxxxxxx] Sent: Friday, December 12, 2003 8:42 AM To: [ExchangeList] Subject: [exchangelist] RE: delayed emails http://www.MSExchange.org/ I was able to telnet earlier in the week, but am not able to right now. i am getting the following error message: Connecting To mail.cityharvet.org...Could not open a connection to host on port 25 : Connect failed The exchange server is not open to accept internet mails directly, they go through a firewall first. Jen -----Original Message----- From: Muqeemuddin Syed [mailto:muqeems@xxxxxxxxxxx] Sent: Thursday, December 11, 2003 2:30 AM To: [ExchangeList] Subject: [exchangelist] RE: delayed emails http://www.MSExchange.org/ Jen, Did you test to telnet to your mail server and send a mail to a recipient, this should help you to identify if the delays are caused at your server or at the ISP side. One more thing, is your Exchange server open to accept internet mails directly, or are you using your ISP E-Mail server to relay all incoming mails to you -----Original Message----- From: Jen [mailto:jmar@xxxxxxxxxxxxxxx] Sent: Tuesday, December 09, 2003 12:17 AM To: [ExchangeList] Subject: [exchangelist] RE: delayed emails http://www.MSExchange.org/ i have another example...here it is. but also, i haven't been getting any of the exchange list discussion threads like i usually do. what lies b/w the sender and my exchange server is the isp & firewall. I have checked the firewall and all the configurations are correct. i even had the manufacturer of the firewall double check it for me. they say all is clear on the firewall side. i have a call into my isp, have not yet heard back yet. here is another header...THANKS! Microsoft Mail Internet Headers Version 2.0 Received: from srv-exchange2.adtran.com ([208.61.208.100]) by hera.olympus with Microsoft SMTPSVC(5.0.2195.6713); Mon, 8 Dec 2003 12:22:39 -0500 Received: by srv-exchange2.adtran.com with Internet Mail Service (5.5.2657.72) id <YK1VCRKX>; Mon, 8 Dec 2003 11:22:39 -0600 Message-ID: <39B01E2189D99F4B8C9612462DB3922A0D26953C@xxxxxxxxxxxxxxxxxxxxxxx> From: ADAM BILYEU <adam.bilyeu@xxxxxxxxxx> To: "'jmar@xxxxxxxxxxxxxxx'" <jmar@xxxxxxxxxxxxxxx> Subject: email test Date: Mon, 8 Dec 2003 11:19:05 -0600 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain; charset="iso-8859-1" Return-Path: adam.bilyeu@xxxxxxxxxx X-OriginalArrivalTime: 08 Dec 2003 17:22:39.0884 (UTC) FILETIME=[E1A0BCC0:01C3BDAF] ------------------------------------------------------ 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 ------------------------------------------------------ ------------------------------------------------------ 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 ------------------------------------------------------