Memory usage

Hi all,

I've written a simple perl script using MailBox to scan through a
MailDir, checking the age of messages, and moving or deleting them given
certain rules.

Whilst the script seems to work ok, it does take a long time to run, but
the main problem is memory usage - with a big folder with, say, 5000
messages in it, the script exhausts the memory on the machine.

Is there anything I can do to improve either of the above?

Thanks in advance.

-- 
Miah Gregory