-If the
-.I address-group
-starts with an \*(lq=\*(rq, the
-system's group database
-is consulted for the Unix-group named after the \*(lq=\*(rq. Each login name
-occurring as a member of the group is added to the
-.I address-list
-for the alias.
-.PP
-In contrast, if the
-.I address-group
-starts with a \*(lq+\*(rq, the system's group database
-is consulted to determine the group-id of the
-Unix-group named after the \*(lq+\*(rq. Each login name occurring in the
-system's password database
-whose group-id is indicated by this group is
-added to the
-.I address-list
-for the alias.
-.PP