Rules Work Sporadically

[Mitch]

I use an email classification tool (POPfile . . . getpopfile.org) that
marks each email header using X-Text-Classification. I then set up rules in
Outlook to recognize the header text and move the email to the proper folder.


Here is the problem: sometimes Outlook places the email into the correct
folder and sometimes it just lets the email pass through into the default
folder even though the header reflects the proper X-Text-Classification.

Does anyone have any idea why this rule would only work sporadically?

Thanks.