> On May 1, 2017, at 10:33 AM, Jeremy Harris <[email protected]> wrote:
> 
> Having looked again at the coding I do not see that behaviour.
> Have you verified this by experiment?

Yes, with Phil Pennock doing the test.  Example domains that
should fail, but I believe don't with Exim are:

        truman.edu
        techtrack.gov
        mof.gov.tw

http://dnsviz.net/d/_25._tcp.barracuda.truman.edu/dnssec/
http://dnsviz.net/d/_25._tcp.mx1.techtrack.gov/dnssec/
http://dnsviz.net/d/_25._tcp.mail.mof.gov.tw/dnssec/

$ dig +noall +comment -t tlsa _25._tcp.barracuda.truman.edu
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 4694
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 8192

-- 
        Viktor.


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