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List:       postfix-users
Subject:    [pfx] Re: where setup permit_mx_backup
From:       Wietse Venema via Postfix-users <postfix-users () postfix ! org>
Date:       2023-07-11 13:08:50
Message-ID: 4R0h5Z2CgFzJrP1 () spike ! porcupine ! org
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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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