I believe the purpose of the question is not just Barracuda but to understand the system better.
Lets say your company email is blocked by Barracuda security system when you sent an email to a friend at his company. Your email cannot be delivered because they recognized your email address as spam (lets say your company sends a lot of emails as most companies do). Now we know that it could also be because of a virus on the computer and that is why your email is blocked. Ok that makes sense.
But if I sent the same company an email from the same computer with yahoo or gmail, it is delivered successfully?
My question is what stamps are used by Barracuda to block you? How does the system work. Doesn't Barracuda identify spammers by their IP address? If that is true, why one IP address can send email from one account but not the other?
Does anyone has insight into it and what is the best way to resolve this issues?