On Fri, Aug 9, 2024 at 4:20 PM Jeremy Harris via Exim-users <
exim-users@lists.exim.org> wrote:
> On 09/08/2024 14:16, Jan Ingvoldstad via Exim-users wrote:
> > ${lookup dnsdb{mxh=$sender_address_domain}{$value}{lookup
> > dnsdb{a=$sender_address_domain}}}
>
> An mxh lookup gets you a name (which should be key for a further
> A or AAAA). Not an IP.
>
Yes, but as a shorthand for checking whether email might be deliverable,
you look up either whether there is at least one MX record, or whether
there is an A or AAAA record.
Actual delivery would check whether the MX record(s) have valid and usable
A/AAAA records, etc.
>
>
> Separately, there's an a+ lookup for getting both AAAA and A in one hit.
> There isn't a an mxh+ though, would might be cute. Bug 1270.
>
It would be *really* cute if there was a mail deliverability DNS lookup.
But for my example above, I think the mxh+ and a+ lookups in combination
would be good enough?
--
Jan
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