@oliv /etc/postfix/transport :
# 2023-07-04 Gandi utilise une liste noire qui bloque leurs propres
# adresses IPv6
# https://twitter.com/bortzmeyer/status/1676163052700409856
fb.mail.gandi.net ip:[217.70.178.1]
spool.mail.gandi.net ip:[217.70.178.215]