On 2024-03-10, Viktor Dukhovni via Exim-users <exim-users@???> wrote:
> On Sat, Mar 09, 2024 at 09:26:39PM +0000, Julian Bradfield via Exim-users wrote:
> When Exim or any other MTA relays mail with "%" or "!" addresses to an
> internal MTA, that MTA might be configured to support legacy address
> syntax forms. The combined front-end + internal system becomes an
> open relay.
That would be a configuration problem for that site - not a reason to
stop your users replying to perfectly valid addresses.
> And by the way, by default Postfix still supports % and ! addresses:
>
> https://www.postfix.org/postconf.5.html#allow_percent_hack
> https://www.postfix.org/postconf.5.html#swap_bangpath
But it doesn't route them.
https://www.postfix.org/postconf.5.html#allow_untrusted_routing
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