Le 10 mars 2023 Jeremy Ardley a écrit :
smtpd_recipient_restrictions =
permit_sasl_authenticated
permit_mynetworks
reject_unauth_destination
reject_invalid_hostname
reject_non_fqdn_hostname
reject_non_fqdn_sender
reject_non_fqdn_recipient
reject_unknown_sender_domain
If I read the docs reject_invalid_hostname and reject_non_fqdn_hostname
are for postfix version < 2.3. Now its reject_non_fqdn_helo_hostname and
reject_invalid_helo_hostname to put on smtpd_helo_restrictions. You have
an old debian ?