About this Add-on
DOES NOT WORK WITH THUNDERBIRD v68+
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Pull requests for TB68 compatibility are welcomed: https://github.com/acabal/thunderbird-addons
For TB < 68:
This addon is useful for people who use IMAP servers that pre-sort junk mail for you. Because Thunderbird message filters only affect the inbox and not pre-sorted mail, you can be left with a junk mail folder that always has unread messages. This addon simply marks all folders named "spam", "junk", or recognized as junk folders by Thunderbird as read.