For new players, it would help if the Preview facility added the signature.
As it is, you write the message, and:
- the Live Preview at the bottom misses out the heading line ("Letter from Crip Grindle" or whatever)
- the Live Preview at the bottom misses out the sign-off line ("Crip Grindle, Knight of Elroth" or whatever)
- the Message Preview after you click the preview button contains the heading, but misses out the sign-off as well
Any diligent new player, who makes use of the Preview function to check they have done the right thing, will be shown that there is no signature and that they should add their own. And then they add it, click Send, and the game adds another one without warning, making them look a bit silly.
So perhaps fixing that would help new players start off on the right foot 
I think this is a great idea, and a very simple way to fix a simple (but annoying) problem.
