This is a tricky tool to create and is currently in development.

Text has to look perfect (or very close to perfect) in every email client. Doing even simple things like line-height require loads of inline CSS, hacks and black magic. So creating a text editor is two big jobs:

1. Getting consistent text across all clients.

2. Then wrapping all this up in an editor.

I just want it to be spot on first time, that's why a text editor isn't in Mailrox at the moment, because it would be a crap rushed one. Rest assured quality text editing is coming. :)