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Barracuda 300 Spam and Virus FW  - Can't connect to port 25 from outside clients

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Last Modified: 2013-11-16
Greetings!  

I've been trying to figure out my problem for hours!  

I have an existing exchange server that had surfcontrol installed... I removed it and set it up with a Barracuda Spam and Virus Firewall.

SOMEHOW email is coming in just fine... however from outside of our LAN I can't telnet or connect via Outlook.  I've had several others try from different connections with the same results.

I have many NAT rules on our Watchguard firewall... I've never had a problem.  In fact I can access the  I don't understand how it's not allowing a client to send email through. I'm 99.9% sure it's not the firewall causing the issue.

It sends email from other servers just fine!

HELO please-read-policy.mxtoolbox.com
250 xxxxxxxxx Hello recover.mxtoolbox.com [64.20.227.133], pleased to meet you [55 ms]
MAIL FROM: <supertool@mxtoolbox.com>
250 Ok [54 ms]
RCPT TO: <test@example.com>
550 No such domain at this location (test@example.com) [69 ms]
QUIT
221 Bye [55 ms]

I'm stumped!  I have done a lot of trial and error with no luck.  I can provide a lot more information if someone is willing to help me out.  I'm certain it's the Barracuda but I can't figure out what exactly :(
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