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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Updates to ‘Define Rules’ screen

We’ve made some improvements to the ‘Define Rules’ screen, which is one of your choices under the ‘Options’ link.

  • The different sections are now grouped together into “tabs” near the top of the screen. Click on these to see the various rules. Click on “All” to see all of the rules at once. The intention of this change is to make the screen a bit more manageable, so you’re not presented with too much information at once.
  • For the individual rules, you can now select how you’d like the text matched (Contains/Is exactly/Begins with/Ends with).
  • Also, when filing messages into a folder, you can now specify that you would like the message to be Flagged.
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