There are a number of tools that allow for IMF whitelisting. I ran across a very cheap option called Encoda’s IMF Whitelist Service today, however I have not tried it yet.
http://www.encoda.com/iws/index.html
Has anybody used this product?
- Joel
Another IMF tuning product called IMF Tune also looks to have some promise. They don't have a free demo so I have not tried it yet.
http://www.windeveloper.com/imftune/default.htm
If you are looking a inexpensive tool that provides Exchange IMF whitelist functionality, have a look at SmartIMF Manager.
http://www.n2nets.com/SmartIMF.html
They have a 30 day free trial. It runs as a background service and can automatically delete old spam from your Archive folder too. You can also manage it from a PC. Highly recommended.