[pfx] Re: Question about the parameter: permit_mx_backup_networks

Klaus Tachtler via Postfix-users:
> Hello,
> 
> I have a question about the parameter: permit_mx_backup_networks 
> (default: empty).
> 
> In https://www.postfix.org/DEPRECATION_README.html#permit_mx_backup, 
> `permit_mx_backup` is listed as deprecated.
> 
> And in 
> https://www.postfix.org/STANDARD_CONFIGURATION_README.html#backup, 
> `permit_mx_backup_networks` isn't mentioned.
> 
> Does the `permit_mx_backup_networks` parameter still have any 
> significance at all?

permit_mx_backup was maybe useful 30+ years ago.

Nowadays, a backup MX host needs to know who are the valid recipients,
otherwise the backup MX accepts spam for a non-existent recipient,
tries to deliver it to the backed-up domain, and then tries to
return it to a sender who did not send that spam.

	Wietse
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