On Wed, Aug 07, 2024 at 09:12:57AM +0100, Jeremy Harris via Exim-users wrote:
> On 06/08/2024 21:16, Ian Z via Exim-users wrote:
> > Does non-callout sender verification of nonlocal addresses, in the case of
> > a dnslookup router, determine the MX host of the sender domain?
>
> No (and there could well be more than one...).
>
> You could do a dns lookup explicitly:
> ${lookup dnsdb{mxh=$sender_address_domain}}
>
> https://exim.org/exim-html-current/doc/html/spec_html/ch-file_and_database_lookups.html#SECTdnsdb
FWIW, that's the sort of thing I was alluding to, ACLs based on
properties of the envelope sender address that can be ascertained via,
e.g., DNS and don't require an active SMTP connection (thus aren't
"sender verification" callouts).
--
Viktor.
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