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IANA Allocation Guidelines For Values In the Internet Protocol and Related Headers
RFC 2780 part of BCP 37

Recipient expansions

Mail trigger To Cc
doc_added_comment rfc2780@ietf.org
doc_state_edited rfc2780@ietf.org
ipr_posted_on_doc rfc2780@ietf.org ipr-announce@ietf.org