Mail sending problems
Sometimes, the SMTP (Gandi here) returns an error. That error should be handled in the organizer panel display!
[2019-11-28 17:52:59] prod.ERROR: Swift_TransportException: Expected response code 250 but got code "550", with message "550 5.7.1 Reject for policy reason RULE3_2. See http://postmaster.gandi.net