Assegnate 1 su 5 stelle

Either I don't know how to use it, or it don't work or me?
I entered BCC then a group name,
then Not to then a address in the group.
The not to address was still sent using Thunderbird 31.4

It is broken since the update to 31.4...
Sorry!
I will correct it as soon as I get 5 minutes free time!
(within one week maximum)