Sorry for the delay…I got distracted with actual work 
I tried to implement support for unicode. I’m not sure if it works (gmail is blocked at work)…can you test it out and give some feedback? I also added some functionality to allow you to be prompted for any/all of the mail fields but it requires a bit of configuration (see the TODOs at the top of the file).
Check it out here:
github.com/jbjornson/SublimeGMa … r/GMail.py
If there are issues maybe you can open an issue on the github repository rather than boring the people in the sublime forum here 
github.com/jbjornson/SublimeGMail/issues
If it works I’ll split the configuration into a settings file and look into adding other features…