We run qpopper 4.0.3 I know that this version has the option of defining for individual users that no temp file (.username.pop) be created for him when he accessed his mail (i did it by creating a file called .username.qpopper-options under the /var/spool/mail directory)
It'll be even more useful if somehow we could force for some user that when he has downloaded his mail to his pc pop client machine, that the mail which is left on the mail server is cleaned as well (We have many many users who just leave several 100 Mb of mails without deleting them) I doubt if this is possible or not
