Comment 152 for bug 308181

The goal in RFC 8314 was to reasonably promote security/interoperability improvements without forcing a lot of software to be declared broken. It wasn't actually based on what Thunderbird does, but if that's the impression, that's good.

The IETF has backed SRV records in general and email+SRV in particular so the spec followed that trend on the auto-configuration front. If the various ad-hoc proposals for HTTP+XML email auto-configuration were to come up with a single compromise proposal and bring that to the IETF, I wouldn't expect major problems moving that to the standards track, but unless that's done, DNS SRV is the only standard for email account auto-configuration and Thunderbird has a standards-gap by not implementing it.