Improved spam filtering via greylisting

We’ve now implemented a greylisting policy on all incoming email to FastMail servers. Greylisting is a technique designed to stop spam from “zombie machines“. We’ve chosen a conservative approach which should be effective at stopping spam, while at the same time not delaying any regular email. For more information on this, see this forum post.

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Backscatter filter improvements

Last week we rolled out improvements to the backscatter detector. Most of these were to handle oddly formatted bounce emails from different systems and the results suggest that we’re now catching almost all the backscatter bounces from email systems that contain the original email headers in some way.

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