I think this is OK. That's what you get for using a domain who does this
sort of thing as your email provider.
Right. But again, if I'm trying to find your key, I have no way to know
how sleazy your mail provider is, so I have no way to tell whether to
trust the keys they publish.
I do consider this proposal's handling of this case superior to the key
A key you get from the key servers might be real or might be bogus. A key
you get through DANE might be real or might be bogus. What's the
difference? A key from DANE implicitly has an endorsement from the
domain, but a key from key servers can have endorsements via WoT
signatures. In each case. unless you know the endorser, the endorsement