Thank you for your answer.
I must say that I really don’t understand what in my current installation doesn’t work for sending emails !
I just received the “new version” notification by mail, with the good postmaster…
but when someone try to connect, he doesn’t receive the email (the good admin options seem checked) => those email sending doesn’t even appears in /admin/email/sent (nor bounced, ignored or rejected).
Grmbl.
Thank you for you time I’ll try to reinstall it from the beginning with an nginx later 