custom mail forwarder/relay program?

[Patton, Matthew [Contractor]]

I need a way for Postfix to listen to SMTP (think smarthost) and then re-send 
all emails via HTTP POST operation. Is the correct way to tackle this (aside 
from telling them to go to hell) a transport definition using Pipe(8)? I've 
never done this before and it doesn't appear to be a very common scenario. 
Otherwise I could write a small Perl program that is launched via inetd, that 
would do the same even though it wouldn't be very efficient.