Spam Filter for Exchange 2k3 and BES.
Our current system has 1 mailserver(server 2k3, Exchange 2k3) and a Blackberry Server for approximately 20 users. We have GFI Mail Essentials 12 installed, and have over 60k of ham mail and 40k of spam mail in the respective databases. However, a tremendous amount of spam is still getting through, and I am wary of having the individual users drop mail into the "this is legitimate" " this is spam" folders. Also, the way GFI works, if I understand it correctly, is that the spam hits the exchange server, then the filter is applied, then the spam is moved to the junk folder. This is no good when it comes to the blackberry, as the email from the blackberry is pulled from exchange not outlook, therefore it pulls much of the spam over.
What I have done:
I have instituted a 2 minute delay from when the mail is received to when it is delivered via the BES. I figured this would allow time for the filter to apply the proper constraints, and forward only the legitimate mail from the user's inbox- not the junk folder.
I sat with the owner of my company to see how much spam is still getting through, and he is innundated with over 100 a day. Sooo, the sam filter is not working. Does anyone have any suggestions on a spam filter that filters prior to being received by exchange?