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ABNF for IMF – Internet Message Format – RFC 5322

Message Format   Fields   Address   Date‑Time   Lexical Tokens

IMF — Message Format

RFC 5322 – Section 3.5

message   =
( fields  /  obs-fields )   [ CRLF   body ]
fields   =
*(
trace
*(
resent‑date  /  resent‑from  /  resent‑sender  /  resent‑to  /  resent‑cc  /  resent‑bcc  /  resent‑msg‑id
 )
 )
*(
orig‑date  /  from  /  sender  /  reply‑to  /  to  /  cc  /  bcc  /  message‑id  /  in‑reply‑to  /  references  /  subject  /  comments  /  keywords  /  optional‑field
 )
obs-fields   =
*(
obs‑return  /  obs‑received  /  obs‑orig‑date  /  obs‑from  /  obs‑sender  /  obs‑reply‑to  /  obs‑to  /  obs‑cc  /  obs‑bcc  /  obs‑message‑id  /  obs‑in‑reply‑to  /  obs‑references  /  obs‑subject  /  obs‑comments  /  obs‑keywords  /  obs‑resent‑date  /  obs‑resent‑from  /  obs‑resent‑send  /  obs‑resent‑rply  /  obs‑resent‑to  /  obs‑resent‑cc  /  obs‑resent‑bcc  /  obs‑resent‑mid  /  obs‑optional
 )
body   =
( *( *998text   CRLF )   *998text )  /  obs-body
obs-body   =
*(   ( *LF   *CR   *( ( %d0  /  text )   *LF   *CR )  )   /   CRLF  )
text   =
%d1-9  /  %d11  /  %d12  /  %d14-127
;  Characters excluding CR and LF