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Spam Filter Comparison: Who makes the best spam filter?

To find out, we asked our 25,000 registered users to take a 30-second anti-spam comparison survey. Over 1,200 people responded and rated their filters with a letter grade from A-F. The results for all filters with 3 or more responses (slightly over 1,000 responses for the top 50 systems) are summarized below and sorted with the highest rated on top. Dates of the responses are 6/29/06 - 7/20/06.

See also:
Manufacturer Product name # responses Grade
keir.net K9 Spam Filter Software 3 A
Abaca Email Protection Gateway 3 A
MX Logic Email Defense 4 A
mailscanner.info MailScanner 19 A-
popfile.sourceforge.net PopFile 3 A-
assp.sourceforge.net Anti-Spam SMTP Proxy (ASSP) 4 A-
Fastmail Unit Trust FastMail 4 A-
Spam Arrest LLC Spam Arrest 8 B+
Cloudmark Cloudmark Desktop 17 B+
Vircom modusMail - modusGate 4 B+
Firetrust Mailwasher Pro 21 B
Postini Perimeter Manager 17 B
Google Mail 45 B
spambayes.sourceforge.net SpamBayes 21 B
Commtouch Anti-Spam Engine 3 B
Zone Labs ZoneAlarm Internet Security Suite 3 B
SonicWALL Email Security Appliances 10 B
Symantec Brightmail Anti-Spam 12 B
c-command.com SpamSieve 10 B
GFI Software GFI Mail Essentials 7 B
Symantec Norton AntiSpam 34 B
spamcop.net SpamCop 18 B
Earthlink SpamBlocker 48 B
AOL AOL Mail 134 B-
Apple Mac Mail 51 B-
Yahoo SpamGuard 76 B-
spamassassin.apache.org SpamAssassin 56 B-
various RBL lists 3 B-
SurfControl E-mail Filter 4 3 B-
Symantec Mail Security 9 B-
Symantec Norton Internet Security 2006 74 B-
Qurb eTrust Anti-Spam (formerly Qurb) 5 B-
mozilla.com Thuderbird built-in spam filter 32 B-
Microsoft Exchange Server spam filter 12 B-
Barracuda Networks Spam Firewall 5 C+
Nuclear Elephant.com DSPAM 3 C+
TrendMicro InterScan Suite 3 C+
Symantec AntiVirus for SMTP 8 C+
Microsoft Outlook desktop built-in 99 C
Trend Micro PC-cillin 22 C
Microsoft Hotmail 39 C
Verizon Online Spam Detector 5 C
Sunbelt Software iHateSpam 9 C
GWAVA Guinevere 4 C
McAfee SpamKiller 6 16 C
sourceforge.net AntiSpam Mail Filter 3 C-
Road Runner Road Runner ISP filtering 3 C-
Eudora Eudora 4 C-
Juno Juno 3 D+

 

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