Have AS/400 act on an email message

How would I get the AS/400 to act on an email message? For example, the
mailman mailing list software lets you put commands in a message body, and a
program acts on the message when received.

I get an email from our material planners every Friday for the parameters
for our weekly MRP submission. Now the MRP submission is mostly automated,
once I have these parameters. What I would like is for the planner to send
an email to the AS/400, and have a program grab the email body, verify the
MRP parameters (done), and run the MRP submission program.

I know I must set up POP3 on the 400, but where/how do I hook to run custom
programs when emails are received? Any pointers to doco welcome.

Thanks,
Loyd

--  
Loyd Goodbar
Programmer/analyst
BorgWarner Incorporated
ETS/Water Valley
662-473-5713
lgoodbar@xxxxxxxxxxxxxx