I think we personalize all our emails with custom greetings (i.e. Hello Giorgos, blah blah) and we don't send the same email to many recipients.

The only actions that send the same email to multiple users are when mentors use the "mail my mentees button" or the "email event attendees button". Both these target a couple dozens at most typically and they are not used that often. Therefore I think it's OK to send them this way to avoid complicating the code more.

Do you have reasons to believe that this will cause trouble @johngian ?