I currently use fetchmail/procmail to sort incoming mail into imap mailboxes.
I would think it is possible to set up a cron script to use procmail to
expire read messages in the mailing list mailboxes. 
Would this be a good way to go about it, if so can anyone point me in the
right direction.
-- 
  Brian Duffell    RiscPC600      | StrongARM 233Mhz RISC OS 4 66Mb
  Linux PCs on RISC OS network    |  
  <www.dare-asc.co.uk>            | <www.darlington-masters.org>
 
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