On 2024-03-10, Viktor Dukhovni via Exim-users <[email protected]> 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 -- ## subscription configuration (requires account): ## https://lists.exim.org/mailman3/postorius/lists/exim-users.lists.exim.org/ ## unsubscribe (doesn't require an account): ## [email protected] ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
