Handling old mail

[sys0001 at dircon.uucp]

Can anyone suggest a program which will handle the ageing of mail?

What I'm looking for is a program which looks at a user's mailbox file
(in /usr/spool/mail) and transfers all messages older than, say, a month
to a specified file in the user's own home directory. 

This is needed to overcome the problem of users getting round their
disk quotas by leaving big messages in their system mailbox, rather
than in their own directory structures.

If this program works with MMDF-style mailboxes, then so much the better.

-- 
sys0001 at dircon.UUCP   or   sys0001%dircon at ukc.ac.uk