Why has the spam catch rate suddenly declined?

If the general effectiveness of spam detection declines, it is most likely related to the following issues:

Ensure that PureMessage is using the latest anti-spam engine package by navigating to the Support > Check for Updates page in ffthe PureMessage Manager, clicking Query to see if an update is available for the PureMessage-AntiSpam-Engine. If there is, run pmx-setup at the command line to install the available update(s).

Ensure that PureMessage is using the latest anti-spam data package by navigating to the Support > View Installed Packages page in the PureMessage Manager, and examining the date of the PureMessage-AntiSpam-Data package. It should be the current day's date. If it isn't, check the Support > Check for Updates page, as described above, and update the package.

The issues described above affect overall spam detection. To troubleshoot a specific message, see "Why didn't PureMessage quarantine a message that is spam?" Also, see "Deployment Strategies" in the Getting Started Guide for information about configuring message-specific aspects of spam detection, such as whitelists, blacklists and custom anti-spam rules.