First, is your subject line correct?  It must be
EXACTLY as presented on the PRS info page, 

PRS registration for PHY 131

Second, did your email contain only a single line?
My program will automatically reject your email
if there is more than one typed line.

Third, if you used an HTML emailer, did you
turn OFF html and send your email as text only?

Fourth, is there exactly one space between each
entry in your registration line.

Fifth, does the PRS ID you sent have 9 digits,
and are at least the first two "00".  If you
sent a number that begins with "9" my program
will assume you sent your ASU ID instead of your
PRS ID and your email will be rejected.  If you
sent a number that begins with "1" my program
will assume you sent the store UPC code number
instead of your PRS ID and your email will be 
rejected.  Go back to the PRS info page to 
figure out how to find your PRS ID number.

Sixth, did you send the right posting ID?  My
program will reject anything that is not 4 digits,
followed by a hyphen, followed by 3 digits.

Seventh, did you include the proper section letter?