[MlMt] Defer sending by default - solved

[Stephan Bösebeck]

Thanks a lot for your help, the suggestion with the defaults write 
option suggested by Ed worked fine. And you are right, 5 minutes is 
probably too long. 45 Seconds is maybe the sweetspot there. I will try 
that.

The suggestion from Robert did not work for my unfortunately. I already 
had the "Send Later" field visible. But adding some delay there and 
storing it as "Default" did show anything when creating a new email.

Nevertheless, problem solved and thanks a lot - awesome help!

Stephan