Semi OT: scripting help

[Vermyndax]

I have my SpamAssassin forwarding to a user that operates as a spam 
quarantine mailbox.  All users have access to this mailbox to go through 
and delete spam at will.

I would like to have a script that runs as a cron job that tar/gzip's 
all of the messages and then empties the 
/home/spamcatcher/.maildir/cur/* directory.  I would like to keep up to 
5 weeks worth of these tar gzip's and rotate them out as time progresses.

Can any of you guys help this scripting newbie whip up something like that?
Mucho danke if so :)
--JM
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