$GID in From: field.

[Majordomo list server <majordom @ gange . intesys . it>]

Dear all,
I (each subcscribed user of the list)
obtain the group_name rather the login_name
in the From: fields of all the mail sent to
mylist by a not subscribed user.

When a subscribed user write to
mylist
every mail sent to mylist subscribed users
contains
"To mylist@my.machine.org"
rather the sender_users@sender.user.domain

Any idea?

Thanks in advance 4 all you help. 

best regards, 
Alberto