If you want FormMail to send email containing your form results, then you need to set "recipients".
To protect it from spammers, use the AT_MANGLE feature.
If you really want to, you can set those variables that way (after the configuration section). But you also need to put the email address into the posted data, like this:
Now with the TectTite formmail.php script I made a connection to the database in the formmail.php file, spit my email into the $TARGET_EMAIL, DEF_ALERT, and $FROM_USER variables.
$aFormVars["recipients"] = $YourVariableName;