Sidelining Versus Tagging
By default, DSPAM is designed to perform message sidelining. That is, it places any message it determines as spam into a “quarantine” area, which requires the user to log in to the DSPAM cgi-bin management utility and view the quarantine in order to check for false positives. This is a good solution for some circumstances because it doesn’t require changes on the end-user email client like tagging does.
The alternative is to filter the messages at the email client by using the tags added by DSPAM. Although it’s more work to set up, it may be beneficial to do this in certain situations. Here is an example set of message headers added by DSPAM:
X-DSPAM-Result: Spam X-DSPAM-Confidence: 0.9997 X-DSPAM-Probability: ...