spam on eXchange 2003

I have a barracuda on my network but I'm getting A LOT of spam in the queues.  Looks like it's bypassing the barracuda and hitting the server directly on its IP and bypassing the MX record(barracuda).

I know,... i know... we're in the process of migrating to exchange 2010.

for now.... how do I BLOCK all fake senders?? How can I fix this?
Anthony H.Asked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
How does your Exchange Server have a public IP / forwarding enabled for SMTP if it's behind the barracuda?  Mail should flow:
INTERNET --> Barracuda --> Exchange
Cloud --> Public IP --> Private IP

The Barracuda should be told to send mail to the exchange server.  Nothing else should be able to reach it.

(Disclaimer - I've never worked with a Barracuda appliance, but most spam systems have a configuration to tell it where to send the mail for a given domain.

You could also adjust your firewall so that ONLY the IP of the barracuda can communicate with the Exchange SMTP server over port 25).

(Honestly, I haven't used Exchange 2003 in YEARS... it's 12 years old - you know, you know - this is one of the problems taking so long to update your network (and Exchange 2010?  I like it... but if you were to move to eXchange it should be 2013 - you're shooting yourself in the foot as you'll need to do it again sooner than later).

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