I don't think you tracked the behavior in the bug report.
If checkdnsrr() is doing an MX query -- not including implicit MX,
only explicit MX -- it must fail when there is no MX record. It can't
return `true` when there is a CNAME (and no MX record for the
canonical hostname, only an A) but `false` when there is an A (and no
MX record). That isn't an MX query, nor is it the way smtp-senders
operate, now or 16 years ago.
To quote the bug report, if somehost.example.com is a CNAME for
example.com, and example.com has an A record but no MX,
checkdnsrr('somehost.example.com') must not return different results
than checkdnsrr('example.com'). Either the function is trying to be
"smart" and emulate an smtp-sender (bad idea) and succeeds on both, or
it stays dumb and fails on both.
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