Spam filtering for qmail

SPAM is a real hassle. It wastes time and clutters up your e-mail INBOX. In fact, it can be offensive. Wouldn’t your day be easier if you didn’t have to delete all of the SPAM you get?

Fight back! There are real tools you can use to fight SPAM.

• Brightmail
  
  Benefits: claimed 1 in 1,000,000 false-positive rate which means legitimate e-mail is almost never lost
  Downsides: e-mail has to pass through a third-party server before your server
  Cost: you pay per user; the minimum total license fee is $1000/year per company
  
  Enterprise spam filtering solution. Brightmail created a probe network of thousands of dummy e-mail addresses which receive only SPAM. The Brightmail company looks at this SPAM and then filters messages which look exactly the same, to get a very low false-positive rate.
  
  
• SpamAssassin
  
  Benefits: free; easy to install
  Downsides: higher false-positive rate (although the sensitivity is adjustable) which means legitimate e-mail can be lost
  Cost: free; open source software
  
  SpamAssasin is a heuristic based filter – this means that it looks for tell-tale characteristics of SPAM, such as particular phrases like “click here,” “FREE,” or “viagra” and other known characteristics. However, legitimate e-mail can also have these characteristics, so SpamAssasin can easily be wrong.
  
  
• Spambayes
  
  Benefits: free; very good at identifying SPAM when trained properly (not much SPAM gets through and legitimate e-mail is almost never lost)
  Downsides: training is not dummy-proof; must be installed on each client computer and only works with Outlook (server support is coming); technically alpha quality software
  Cost: free; open source software
  
  Spambayes is a classifier engine – you train it on an archive of spam and legitimate e-mail messages that you have received, and it learns the difference. This training makes it very effective, because it learns not only what SPAM looks like, but what your legitimate e-mail looks like, as well. Spambayes can get more accurate over time: If it is unsure about a message, it will ask you and then learn.

We can help you decide

Confused? Want to know more? We can explain the different anti-spam technologies, listen to your requirements, and help you choose the method best for you.

Contact us or give us a call at 866-374-4678