Rated 3 out of 5 stars

For all of the following reasons, this add-on could be better:

-- On my computer, opening the add-on's Options page causes Thunderbird to crash. If there are options on that page, I can't access them.

-- From what I am able to see of the Options page, this add-on does not appear to be very configurable.

-- The add-on works by creating rules for incoming emails, and it does that when you move an email to a folder. But the add-on doesn't allow you to create a custom rule without moving the email. This is needed because similar spam emails will often arrive from many faked email addresses, and simply moving each one doesn't create a rule that works for all of them.

-- The rules are not very flexible. You cannot, for example, have two rules applied to one email -- doing so would reduce the number of emails moved to the wrong folder.

-- Every time the add-on is used, it puts a confirmation message in the upper-right corner of Thunderbird which stays on the screen for at least 30 seconds -- very annoying!

-- The developer doesn't always respond to emails or requests.

Despite all this, I am still using the add-on, although I may not use it for long.

This review is for a previous version of the add-on (0.2.4).