I have a Custom filter for matching items older than 10 days, and a rule
that uses it to delete the items. I normally use it for purging headers
to keep the cache size down.

If I try to run the rule on the "pan.sent" folder, the messages disappear
from the view, but aren't deleted, so they return when you next start Pan.

Either rules should not work on Folders, or they should "do the right
thing".

The entry in the filters.xml file is:

<filter type="and" name="Old Articles" visible="t">
        <date min_days_old="10"/>
</filter>

and in the rules.xml file is:

<rule name="Purge" filter_name="Old Articles" hits="34534" misses="41519">
             
    <discard/>
</rule>