How do you remove the "-- do not edit --" at the beginning of some emails?
/scp/admin.php >> Email Settings >> Uncheck the box that says: "Removing quoted reply (depends on the tag below)".
If you wanted to change it to something different, log into your mySQL database and modify the "reply_separator" field in the "ost_config" table.
Why log into the mysql database? It is an option under /scp/admin.php >> Email Settings >> Reply Separator Tag
Oops... Hehe.
I guess the code has changed over the years. There is no such thing to edit in scp/admin.php. Hope that this helps the next person who may search and find this tidbit.