[pfx] configuration for backup mx server

[Corey Hickman via Postfix-users]

Hello

My settings for backup MX server are as follows. Do you think if they 
have problems? I am looking for your kind suggestions.

smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, 
permit_mx_backup, reject_unauth_destination

smtpd_sender_restrictions = permit_mynetworks, 
permit_sasl_authenticated, reject_unknown_client_hostname, 
reject_unknown_sender_domain

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 = xx.xx.xx.xx


Thanks in advance.
corey hickman
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