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How to use Thunderbird with GUMail: Using the Junk Mail Filter

In addition to the spam filtering and identification provided by GUMail, you can use the built-in junk filter in Thunderbird. This filter can help catch messages that make it through the GUMail filters. You will “train” Thunderbird’s junk mail filter by telling it which messages that made it into your inbox should be identified as junk.

Ensure you set up rules to filter spam identified by GUMail according to the instructions in How to Use Thunderbird with GUMail: Setting Up GUMail Spam Filters. Start Thunderbird, click on Tools (at the top of the screen), then click on Junk Mail Controls....

This will bring up the Junk Mail Controls window.

Click on Do not mark messages as junk if the sender is in my address book.   Click on When I manually mark messages as Junk and Move them to the "Junk" folder.

Click on the Adaptive Filter tab.   Make sure there is a checkmark beside Enable adaptive junk mail detection.   Then click on the OK button.

When the junk mail rule thinks that a message is junk, it will flag the message with a special icon.

If the junk mail rule is wrong (and the message is not really junk mail), click on the message to highlight it. Then click on the Not Junk icon.

If you get a message that is junk, but the rule has not noticed it (has not flagged it), click on the message, then click on the Junk icon.

When the rule is consistently identifying junk mail correctly, you can have it move the messages automatically.

Open the Junk Mail Control window (as in step 1, above).   Click on Move incoming messages determined to be junk to:.

Note: UIS recommends sending these messages to the Junk folder. Check this folder regularly to make sure nothing has been placed here by mistake. To avoid deleting misidentified mail, do not send junk directly to the trash.   Click on the OK button.