SOME POSSIBLY HELPFUL TIPS:
LANGUAGE PRIFIX - function is related to
UAN - addpost
REG - adduser & verifyemail
WNx - watchnotify
BDAY - cfrm
PDN - changebasic
PREQ/PSND - admin/password misc
PMN - sendmessage
DNM - donotifymod
DAUx - admin/doadduser
DEE - admin/doexportemails
DSE - admin/dosendemail
DMT/DMP - domailthread
VER - email verification
The other items should be self explanatory:
EMAIL_HEADER - header
EMAIL_SALUTE - email "hello, USER"
blah blah blah...
EMAIL_ATTACH - any attachments or gallery related posts.
EMAIL_FOOTER - footer
