Free Anti-spam solution for Exchange?

[lieb39]

Hello everyone,

I'm currently working on setting up a exchange server (2003) for a none-profit organisation. I need a anti-spam solution that is free, since they really can't afford to pay for anything more.

Any suggestions?

Thanks,

lieb39

[GrandMaster]

edit:

nvm

[Aaron P]

Exchange Intelligent Message Filter

http://www.microsoft.com/downloads/details...&displaylang=en

Intelligent Message Filter is based on Microsoft SmartScreen Technology from Microsoft Research. By using e-mail characteristics tracked by SmartScreen technology, Intelligent Message Filter can help determine whether each incoming e-mail message is likely to be spam. Based on this likelihood, you can choose to block e-mail messages at the gateway or at the mailbox store. For more information about Intelligent Message Filter, see Exchange Intelligent Message Filter Overview.

[leedogg]

Try Spampal

http://www.ded.com/nonags/emas.html

[lieb39]

With the Exchange Intelligent Message Filter where does the messages that are marked 'Spam' go? I would like for them to go to the Junk folder..

-lieb39

[Aaron P]

You have two options available to you. Each message gets an SCL (Spam Confidence Level) on a scale from 1 to 9. You could specify that all message marked as a 9 get deleted, whilst 8 and below go to the Junk Mail folder.

[Kosh]

I recommend IMF for a free AntiSpam solution too. It does recognize spam very well if you configure it properly.

The best practice is to set IMF up on the exchange-frontend and then start perfmon.msc (performance monitor).

there you add from "MSExchange Intelligent Messaging Filter" the counters:

"Total Messages Assigned an SCL Rating of..." from 0 to 9

and

"Total Messages Scanned for UCE"

Now save the perfmon settings.

In the beginning you should configure IMF for high SCL Rates.

After a few days (depends on you mail-traffic) watch the performance counters

and configure for messages to block the highest SCL Rate which has the highest amount of mails. e.g. 8

And for the spam that will be delivered to the "Junk Mail Folder" the next lower SCL Rate with the highest amount of mails. e.g. 5.

BTW: If you choose to archive and not to block the "definitive spam" then you should google for "IMF Archive Manager".

It is a free tool for viewing the UCE Archive where you can delete or resend messages.

:)

Hope this helps.

[dan87]

assp is a free open source spam filter that can be used with exchange or other mail servers.

Microsoft's IMF is "ok" I guess, except that its spam definitions aren't updated very often AND they are standard definitions for everyone who uses IMF. This means that since the definitions are exposed to the public, spamers can study its exploits and so your spam will get worse overtime, whereas ASSP is a bayesian spam filter, which means it adapts to the latest spam messages, which are always changing.

good luck