Setting priority in rt-mailgate

I am inserting jobs in to a queue using rt-mailgate by a php script sending
email

however, different jobs require different priority, am i able to set the
priority on a job by job basis from the email, or can i make a different
alias for each job type and point them to a different mailgate command to
set the priority?

thanks

Andrew Xenides
Web Developer
EscapeNet
465 South Road
Keswick SA 5035
T: (08) 8292 5200
F: (08) 8292 5299
E: andrew@staff.esc.net.au
W: http://www.esc.net.au