Your article said:

What about sender reputation systems like Yahoo DomainKeys and
Sender Policy Framework (SPF)? There seems to be a lot of
misinformation regarding what these systems can and cannot do.
MXlogic CTO Scott Chasin says, "The media has done a bad job of
characterizing what these technologies are."

Mr Chasin is indeed correct, and your article is part of the problem. Neither SPF nor DomainKeys are reputation systems. They are *authentication* systems.

There are many anti-spam solutions available to the e-mail administrator, resulting in a daunting task when attempting to pick an anti-spam solution. Some general classifications of anti-spam solutions include (examples in parentheses): > Open source (SpamAssassin) > Standalone commercial applications (Sophos PureMessage for Unix) > Closely integrated with an existing e-mail solution (McAfee Spamkiller for Exchange) > Anti-spam gateway appliance (Ironport X1000) > Anti-spam service

There are many anti-spam solutions available to the e-mail administrator, resulting in a daunting task when attempting to pick an anti-spam solution. Some general classifications of anti-spam solutions include (examples in parentheses): > Open source (SpamAssassin) > Standalone commercial applications (Sophos PureMessage for Unix) > Closely integrated with an existing e-mail solution (McAfee Spamkiller for Exchange) > Anti-spam gateway appliance (Ironport X1000) > Anti-spam service