US
RFC 8551: Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Message Specification
https://www.rfc-editor.org/rfc/rfc8551
…RFC5652 ], [ RFC5750 ], and [ RFC5751 ]. [ SMIMEv3.2 ] refers to [ RFC2634 ], [ RFC3850 ], [ RFC3851 ], [ RFC3852 ], and [ RFC5035 ]. [ SMIMEv4 ] refers to [ RFC2634 ], [ RFC5035 ], [ RFC5652 ], [ RFC8550 ], and this document. 7.2 . Normative References [ CHARSETS ] IANA, "Charac…