For example, to limit arbitrary files to 50 kilobytes, but allow
larger mp3 files to be uploaded by joey into a specific directory, and
-check all attachments for virii, something like this could be used:
+check all attachments for viruses, something like this could be used:
virusfree() and ((user(joey) and podcast/*.mp3 and mimetype(audio/mpeg) and maxsize(15mb)) or (!ispage() and maxsize(50kb)))