This line has the same format as From. If present, mailed replies to the author should be sent to the name given here. Otherwise, replies are mailed to the name on the From line. (This does not prevent additional copies from being sent to recipients named by the replier, or on To or Cc lines.) The full name may be optionally given, in parentheses, as in the From line.
RFC1036: [Source:"RFC-1036"] [Last Changed:December 1987] [Copyright: 1987 M. Horton, R. Adams]
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Up to RFC1036 2.2. Optional Headers
RFC1036 2.1.1. From