This hook has been deprecated. BuddyPress 2.5.0 Use the filters in BP_Email instead.
Fires after the notification is sent that a member has requested group membership.
(int) ID of the group administrator.
(string) Email notification subject text.
(string) Email notification message text.
(int) ID of the user requesting membership.
(int) ID of the group receiving membership request.
(int) ID of the group membership object.