Comercial Vendors Offering Spam Filtering and Email Hosting
To complex to do it yourself. Would you rather have your email hosted or have a front end spam filtering service clean your email for you and pass the good email on to your existing server? Here is a list of vendors who provide spam filtering services based on Spamassassin.
Spam Filtering Front End Services
These are services that clean your email for you and forward the good email to your server. That way you don't have to do it yourself. You point your MX record to their servers and all your incoming email goes to them, they clean it, and send it on to you.
The advantage is that these people a really deep into Spamassassin and other tools and pay far more attention to spam than you might want to. They usually have multiple servers which can buffer your incoming email should your server go offline. The disadvantage of course is that it costs money and you are trusting someone else with your email. But if you have money and you just want the spam to go away, these services might be what you are looking for.
Note to vendors - Let's keep it short here. One paragraph.
[http://www.junkemailfilter.com Junk Email Filter Dot Com] - Front end spam filtering service. Servers are [http://www.exim.org Exim] based and features multi-level spam classification. False positives are avoided by creating a low scoring spam classification where spam is tagged as probably spam and passed on. Higher scoring spam is blocked. Read the details of [http://www.junkemailfilter.com/spam/how_it_works.html how it works]. Endorsed by [http://www.dvorak.org/blog/?p=2595 John Dvorak] of PC Magazine and This Week in Technology. ([http://www.junkemailfilter.com/dvorak.mp3 8 miniute mp3 audio])
Hosted Email Services
These are email hosting vendors who do it all for you. They clean your email and they host your email accounts. If you don't want to go to the trouble of setting all this up yourself you have hires these vendors to do it for you.
Note to vendors - Let's keep it short here. One paragraph.
[http://www.ctyme.com/hosting/ Computer Tyme Hosting] - Home of [http://www.junkemailfilter.com Junk Email Filter Dot Com] and includes email and web hosting services. Several unique services including direct server side folder delivery of IMAP email.