Commits for Reroute Email

Issue #488032 by Zombienaute, mlncn, rfay: Fixed Respect a string in body when that's what we get.

Issue #1252762 by Zombienaute: Added No validation done on the email addresses.

Issue #1233144 by rfay: Use #states to hide irrelevant parts of config form

Issue #1221524 by Cyberwolf, rfay: Added option to turn off the prepended message and put it in e-mail headers instead.