We help IT Professionals succeed at work.
Get Started

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

Last Modified: 2013-11-16

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 [], 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]
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 :(
Watch Question
This problem has been solved!
Unlock 1 Answer and 8 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE