PHP script reads user handle from 'From:' header.
I don't know what's wrong, since I'm not the one hosting this particular incarnation, but if I was to guess it's either very old version of the PHP script ( somehow pretty acient version came to do rounds, scooter sent me that to host for 14 and 16 ) which doesn't handle a lot of stuff present one does ( like teams ), or the email handle is spelt incorrectly and the email is ignored.
I don't know what's wrong, since I'm not the one hosting this particular incarnation, but if I was to guess it's either very old version of the PHP script ( somehow pretty acient version came to do rounds, scooter sent me that to host for 14 and 16 ) which doesn't handle a lot of stuff present one does ( like teams ), or the email handle is spelt incorrectly and the email is ignored.