Don't flag a mailbox address without a distinct name as spoofed.
This fixes annoying, albeit legit addresses like "firstname.lastname@example.org <email@example.com>" from being flagged. Followup to commit b7eea857. * src/engine/rfc822/rfc822-mailbox-address.vala (MailboxAddress): Don't test name for spoofyness if it's not distinct. Add unit test.
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