#9 archiving into multiple mailboxes

Hi,

I think it would be pretty cool if archivemail could
save old mail into multiple mailboxes depending on the
date. The -s switch only uses the current date. IMHO it
would make much more sense to use the date of each
individual message.

That way, I could archive my mail into different files
(per month or year) and the invocation of archivemail
would be idempotent.

Anyway, nice program.

Thanks,
Matthias