On 2024-03-10, Viktor Dukhovni via Exim-users <exim-users@???> wrote:
>> https://www.postfix.org/postconf.5.html#allow_untrusted_routing
>
> You missed an important qualifier "from untrusted clients", if the
> forwarded messages is from a peer system listed in $mynetworks, then
> the message will be (source) routed.
>
> - The edge system adccepts <user%remote@internal>.
> - The internal MTA does not restrict relaying by the edge system.
> - The message is ultimately forwarded to <user@remote>.
Good point.
Of course, there is still the question as to why any form of source
routing should be enabled in a default configuration of anything,
given its almost total obsoleteness.
(I could imagine source routing being useful to communicate from an
isolated network that connects to the outside world only via one very
tied down mail relay, but I wonder if anybody does that.
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