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Exchange Email through firewall (Netvanta 3430) and programming port forward

I have a Netvanta 3430 supplying T1 access to my office. I recently installed a SBS 2003 machine with Exchange. I set up an MX record with my ISP, but the SMTP port 25 is blocked somewhere, so email is not coming through.

Error: No connection could be made because the target machine actively refused it.

I believe this is in the NetVanta. Needs someone with some real pro in them, or this will be another (third this month) deleted question with no points... :(
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Elixir2
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Elixir2
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Elixir2Author Commented:
UPDATE:
I used the NetVanta wizard to configure the firewall. The firewall now forwards port 25 to the SBS server. But still no joy on email.

Using http://www.mxtoolbox.com/diagnostic.aspx it shows the same IP and error as above.

I went to my web host and changed the IP address for mail.subdomain.com to equal the WAN port of the Netvanta. When I ping mail.subdomain.com this morning, it shows the correct IP address. When I put that IP address in the MXToolBox diagnostic, I get a response from my mailserver! It says HELO and says no-relay and all is good.

SO WHY IS THIS NOT WORKING?
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Elixir2Author Commented:
UPDATE:

Using the MX Lookup Tool at the same link as above, it shows the wrong IP address. Is it possible that this DNS change has simply not made it down to the rest of the Internet?  That's very slow imo... but since this is my email I may be rather impatient. :)

IS ANYONE READING THIS?
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Elixir2Author Commented:
LOL. Too slow get back.

I found the solution in the EE article ID:21074806.

Also helpful:
http://www.spamhelp.org/shopenrelay/shopenrelaytest.php
http://support.microsoft.com/kb/323350
http://www.zoneedit.com/smtp.html

What is going on with EE? No responses??

I guess I'm just asking questions that are too hard for the "Experts."
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