telnet query to port 25 returns unexpected answer. can't send mail from my domain to gmail.com
Posted on 2006-05-17
We're using Exchange 2003 and Outlook 2003.
Domain name is mobot.org, organization name is Missouri Botanical Garden, email server name is mbgmail01.mobot.org, ip address is 22.214.171.124.
We can't send mail to gmail.com from inside our domain.
If I use 'telnet mbgmail01.mobot.org 25" from outside our domain it returns '220 MissouriBotanicalGarden'. Inside the domain 'telnet mbgmail 25' returns '220 MBGMail01.mobot.org Microsoft ESMTP MAIL Service, Version: 6.0.3790.1830 rea
dy at Wed, 17 May 2006 15:37:17 -0500'.
I know that the telnet query to the outside should return mbgmail01.mobot.org rather than MissouriBotanicalGarden. And, this probably the reason why we can't have email delivered to gmail.com. MY DNS seems to check out ok, I have both an A record and a PTR record for mbgmail01.mobot.org. We're using Checkpoint for the firewall and have a simple static nat setup. My questions are why would MissouriBotanicalGarden be returned rather than mbgmail01.mobot.org? What will help me resolve this problem? Where should I focus, firewall, DNS, or Exchange?