To
Backport #22566 Change the mailer interface to prevent the leaking of possible hidden email addresses when sending to multiple recipients. Co-authored-by: KN4CK3R <admin@oldschoolhack.me> Co-authored-by: Gusted <williamzijl7@hotmail.com>
Allows to add (not registered) team members by email. related #5353 Invite by mail: ![grafik](https://user-images.githubusercontent.com/1666336/178154779-adcc547f-c0b7-4a2a-a131-4e41a3d9d3ad.png) Pending invitations: ![grafik](https://user-images.githubusercontent.com/1666336/178154882-9d739bb8-2b04-46c1-a025-c1f4be26af98.png) Email: ![grafik](https://user-images.githubusercontent.com/1666336/178164716-f2f90893-7ba6-4a5e-a3db-42538a660258.png) Join form: ![grafik](https://user-images.githubusercontent.com/1666336/178154840-aaab983a-d922-4414-b01a-9b1a19c5cef7.png) Co-authored-by: Jack Hay <jjphay@gmail.com>