So, a domain name erroneously appears in an address field and the references
host erroneously accepts mail it shouldn't.
This degree of problematic operation is not likely to get solved with a new
this specific problem will get solved with a simplification of how email
If someone is sending out invalid email addresses, then that needs to get
rather than working on some post-hoc mechanism.
the two problems are not mutually exclusive. but we can lessen their
Thus, disabling AAAA checking seems to provide much cleaner error
Let's do it for all Internet services, not just email.
worth considering. but for now only 2821bis is on the table.
IETF mailing list