How to send mails in OH3?

Hello all, I’m really interesting with realizing simple rule only with UI (and thus without my buggy scripts) but I really don’t find how to send mail from the action part of the rule editor.

At the top of this topic (Nov 13, 2020), there is a print screen that show the user can select to send mail in the actions through a thing. I’ve tryed many thing but it’s impossible for me to choose sendMail… I just have following list :

By the way, I fully succeed to send mail with scripts which indicate that the mail binding is correctly configured.