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This is a backing piece for #10345. Once merged, I'll do a follow up PR for
RFC822Constraint
for the Name Constraint side.Flagging one thing: this implementation doesn't currently bother with the "quoted" form of mailbox names. These are treated as invalid addresses for the time being, and I've added a testcase as a backstop for that behavior so that it doesn't change unexpectedly.
(I can try with the quoted form, but it'll probably make a PR a decent bit bigger and may just be worth a crate that gets it right. They're also uncommon and the relevant RFCs advise against using them for compatibility reasons.)