Searching for Barracuda alternatives didn't yield much. Can anyone recommend a good spam appliance like Barracuda?
I want something that will strip bad stuff out like if I have a .txt attachment that is really an .exe. It sends the email but strips out the attachment. I didn't think Barracuda did that.
Update: It should be a commercial product (but thanks for other suggestions for open source.)
Update: Must work with Windows and Exchange.
If I was trying to build a high speed large scale filter for email to remove spam and viruses with Open Source software I would look at:
DSpam + ClamAV
They can be configured to work together pretty simply and DSpam has a nice Web Interface for managing everything.
Our office uses the spam blocking feature from WatchGuard firewalls, this way we don't need another device on the network. You could also look to external services that block email before hitting your network like Securence or Postini (albeit Postini support is non-existent).
'Should be commercial'? Don't look at the Open Source MailScanner system then http://www.mailscanner.info/, have a look at its commercial cousin instead: http://www.fsl.com/
There are several questions here on Server Fault that address Barracuda alternatives.
See: Barracuda spam filter alternative - virtualization/appliance friendly?
And: Open Source or lower-cost alternatives to Barracuda Spam Filter
But I'm also entertaining the idea of using a used Barracuda. I've sold and deployed plenty of new spam units, but the license policy is a bit ridiculous (non-transferrable, very unfriendly). Plus, costs have gone way up. There are plenty of used units on eBay, and I think the only downside is not being able to get appliance firmware updates and virus definitions. I believe the Barracuda Central is a standard RBL, and the Bayesian database functionality is still there, so perhaps that could work for you.
