telnet query to port 25 returns unexpected answer. can't send mail from my domain to

Posted on 2006-05-17
Last Modified: 2008-02-01
We're using Exchange 2003 and Outlook 2003.
Domain name is, organization name is Missouri Botanical Garden, email server name is, ip address is
We can't send mail to from inside our domain.
If I use 'telnet 25" from outside our domain it returns '220 MissouriBotanicalGarden'.  Inside the domain 'telnet mbgmail 25' returns '220 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 rather than MissouriBotanicalGarden. And, this probably the reason why we can't have email delivered to   MY DNS seems to check out ok,  I have both an A record and a PTR record for We're using Checkpoint for the firewall and have a simple static nat setup.  My questions are why would MissouriBotanicalGarden be returned rather than  What will help me resolve this problem?  Where should I focus, firewall, DNS, or Exchange?

Question by:Westez
    LVL 104

    Accepted Solution

    Something is getting in the way. Antivirus, Antispam and firewalls can all do this.
    First place I would look is the firewall. See if it has any SMTP filtering capabilities.

    What you want the server to announce itself as is

    I did a DNS report on your domain

    One other thing it shows up is your MX value. I don't know whether you setup the DNS or not, but I was always told never to set the MX as 0 as some servers cannot cope with that. Use 5 as the lowest, then go up in units of five.
    Has absolutely no bearing on the problem, just thought I would mention it.

    LVL 32

    Expert Comment

    Try sending a test mail to from your server using Telnet.

    See this example:
    LVL 32

    Expert Comment

    Sorry, I meant, to from your server.

    Author Comment

    We have a Baraccuda Anti-Spam device.  The SMTP Welcome Banner was set to MissouriBotanicalGarden.  We've changed it to  Now the telnet query from the outside answers up as

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