And the reason you don't want to identify the anti-spam program so other
users of that same software could help you would be?
Did this unmentioned anti-spam software run as an add-in to Outlook?
Have you checked to see if the add-in is still listed in Outlook
(Tools -> Options -> Other -> Advanced)?
Have you contacted this unidentified anti-spam software's author or
support forum to ask how to perform a cleanup after its crappy
uninstall?