Apple Mail, groups, do not show all recipients

Using Yosemite 10.10.3

I have groups that I do not want the addresses to show of all the people in the group names.

in preferences /composing box is not checked to show all members names. With a check or without a check each member of the group sees the long list of addresses.

Does anyone else have this problem? Is it a bug?

thanks

Has invited:

howapple - hello

Favor from:

Just FYI, I just tested this again and it still does not work for me. So, we either both have the same problem, or it just doesn't work.

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