Yep. There is even an RFC for SMIME ACME, but I don’t think such CAs have CT at the moment. A email@domain system using something like SXG and the existing serv

Yep. There is even an RFC for SMIME ACME, but I don’t think such CAs have CT at the moment. A email@domain system using something like SXG and the existing server PKI is probably a more tangible idea atm.