Kentucky wrote:

Hy, when i send message to a group in my contacts, I would that the
receiver sees only the name of the group and not that the name of the
group do be changed with name of the members of the group, can i do
it?

There is no such thing named "groups" in Contacts. Perhaps you mean
"Distribution Lists". If so, and you have a DL named "X" and want your
recipients to see "X" in the To field, create a contact, also named "X",
whose address is your own and put it in the To field while putting the DL
named "X" in the Bcc field.
--
Brian Tillman