Comment 16 for bug 303528

I've just met this bug on a 9.04, but in my case the target folder is in an account whose protocol is "maildir".
I get this line in the filters.xml file:

<folder uri="email://local@local/trash"/>

Changing it to something like this:

<folder uri="email://1243060330.4383.0@benji2/trash"/>

fixes the issue.