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Primarily concerned about mailbox, mailbox-list, and address-list
mailbox - sender, resent-sender
mailbox-list - from, resent-from
address-list - reply-to, to, cc, bcc, resent-to, resent-cc, resent-bcc
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Tokens
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Primitive -- these do not appear in Address Spedifications
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NO-WS-CTL = %d1-8 / ; US-ASCII control characters
%d11 / ; that do not include the
%d12 / ; carriage return, line feed,
%d14-31 / ; and white space characters
%d127
atext = a-z / A-Z / ; Any character except controls,
0-9 /
"!" / "#" / ; SP, and specials.
"$" / "%" / ; Used for atoms
"&" / "'" /
"*" / "+" /
"-" / "/" /
"=" / "?" /
"^" / "_" /
"`" / "{" /
"|" / "}" /
"~"
quoted-pair = "\" (%d0-127)
qtext = NO-WS-CTL / ; Non white space controls
%d33 / ; The rest of the US-ASCII
%d35-91 / ; characters not including "\"
%d93-126 ; or the quote character
WSP = %d32 / %d09 ; SPACE or TAB
ctext = NO-WS-CTL / ; Non white space controls
%d33-39 / ; The rest of the US-ASCII
%d42-91 / ; characters not including "(",
%d93-126 ; ")", or "\"
comment = "(" *([FWS] ccontent) [FWS] ")"
ccontent = ctext / quoted-pair / comment
qcontent = qtext / quoted-pair
dtext = NO-WS-CTL / ; Non white space controls
%d33-90 / ; The rest of the US-ASCII
%d94-126 ; characters not including "[",
; "]", or "\"
Less primitive - these appear in Address Specifications
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FWS = 1*([CRLF] WSP)
CFWS = *([FWS] comment) (([FWS] comment) / FWS)
atom = [CFWS] 1*atext [CFWS]
quoted-string = [CFWS]
" *([FWS] qcontent) [FWS] "
[CFWS]
phrase = word *(word / "." / CFWS)
word = atom / quoted-string
dcontent = dtext / quoted-pair
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Address Specification
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address-list = 1*([address] [CFWS] "," [CFWS]) [address]
address = mailbox / group
mailbox = name-addr / addr-spec
group = display-name ":" [mailbox-list / CFWS] ";"
[CFWS]
mailbox-list = 1*([mailbox] [CFWS] "," [CFWS]) [mailbox]
name-addr = [display-name] angle-addr
display-name = phrase
angle-addr = [CFWS] "<" [obs-route] addr-spec ">" [CFWS]
obs-route = [CFWS] obs-domain-list ":" [CFWS]
obs-domain-list = "@" domain *(*(CFWS / "," ) [CFWS] "@" domain)
domain = domain-literal / obs-domain
domain-literal = [CFWS] "[" *([FWS] dcontent) [FWS] "]" [CFWS]
obs-domain = atom *("." atom)
addr-spec = local-part "@" domain
local-part = word *("." word)
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