/> > I found the options "mx_fail_domains" and "srv_fail_domains" which
treat
> > failed SRV and MX record lookups as if they didn't exist./
>
>
http://exim.org/exim-html-current/doc/html/spec_html/ch-the_dnslookup_router.html#SECTprowitdnsloo
>
"when a DNS lookup in a dnslookup router results in a DNS failure
... in the case of an MX lookup ... matches mx_domains, in which case
routing fails".
>
... if that does what I think, your primay dnslookup router will
decline, and your 4g-specific dnslookup router can have a go.
That's interesting. I think that if I put
mx_fail_domains = *
mx_domains = *
then the side effect would be I could never deliver to a destination
which has an A record but no MX record:
"messages addressed to a domain that matches the list but has no MX
record should be bounced immediately instead of being routed using the
address record"
Admittedly, that should be a pretty rare occurence these days.
Cheers,
Brian.
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