Tom Reed via Postfix-users:
> Greeting list,
>
> besides relay_domains, I can use permit_mx_backup to setup a secondary MX
> server.
permit_mx_backup should be used ONLY after reject_unverified_recipient,
otherwise Postfix will accept mail for non-existent recipients, the
Postfix mail queue will fill up with mailer-daemon messages, and
your server may be blocklisted as a backscatterer.
Wietse
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