オープンなSNSなのに言及や検索に出てこないと死んだサービス扱いされる
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standards - What is the email address format "Name <email>" called? - Super User
https://superuser.com/questions/1625686/what-is-the-email-address-format-name-email-called
RFC 5322: Internet Message Format
https://www.rfc-editor.org/rfc/rfc5322#section-3.4
RFC 5322のSection 3.4と4.4っぽい
