On Tue, 11 Jun 2024 at 05:17, Noel Jones via Postfix-users < postfix-users@postfix.org> wrote:
> You should remove permit_mx_backup. > > This feature is intended for ISP-scale users that may not have a > complete list of domains that use their server as a backup MX. In > this case, permit_mx_backup_networks would define the ISP's customer > network space. > > I've just tried that, but the mail queue filled up with double-bounce messages being sent to postmaster. This is partly the reason why I'd like to sort out my configs, as there's clearly some stuff going on that I don't understand. BTW in the meantime, if I add this (where mx2.mydomain.com is our secondary MX hostname), I take it that would be a good idea: permit_mx_backup_networks = $mynetworks mx2. mydomain.com or is there a way of replacing address verification (if that's what is going on) with something better? Thanks for your help BTW.
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