Quoting Tim Jackson via Exim-users (exim-users@???):
> > I try to send a message to 'info@???', but Exim
> > unexpectedly changes that to 'info@???', based on
> > some DNS queries it seems?
>
> I'm definitely not an expert, but is this not expected behaviour based on
> RFC5321 section 5.1 [1]?
>
> "The lookup first attempts to locate an MX record associated with the
> name. If a CNAME record is found, the resulting name is processed as
> if it were the initial name."
https://exim.org/exim-html-current/doc/html/spec_html/ch-address_rewriting.html
This states, as quoted in my original email, that "One situation in
which Exim does not automatically rewrite a domain is when it is the
name of a CNAME record in the DNS. The older RFCs suggest that such a
domain should be rewritten using the “canonical” name, and some MTAs do
this. The new RFCs do not contain this suggestion."
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