Is clever.
On a machine running sendmail (or similar) which is listening to port 25:
fetchmail --all --keep -p POP3 -u mpciish2 mpciish2.pop.umist.ac.uk |
fetchmail --all --keep --protocol POP3 \ --mda "/usr/lib/sendmail mpciish2" \ -u mpciish2 mpciish2.pop.umist.ac.uk |