[pfx] where setup permit_mx_backup

[Tom Reed via Postfix-users]

Greeting list,

besides relay_domains, I can use permit_mx_backup to setup a secondary MX
server.

I have these setup in main.cf:

smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated,
permit_mx_backup, reject_unauth_destination

smtpd_recipient_restrictions =
   permit_mynetworks,
   permit_sasl_authenticated,
   permit_mx_backup,
   reject_unauth_destination,
   check_policy_service { unix:private/policyd-spf, default_action=DUNNO }

permit_mx_backup_networks = ip_of_primary_mx


That seems to be working.

my question is, do I need to put permit_mx_backup in both
smtpd_relay_restrictions and smtpd_recipient_restrictions sections?

Or putting in just smtpd_relay_restrictions section is fine?

Thank you & regards,
Tom R

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