ABNF for Internet Message Format -- RFC 2822
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RFC2822 specifies a syntax for text messages that are sent
between computer users, within the framework of "electronic mail"
messages. The following ABNF grammar refers to obsolete syntactic elements
(starting with "obs-") that must be interpreted by implementations but
not generated. However, the obsolete syntax itself is not included in this page.
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| NO-WS-CTL | = |
%d1-8 / %d11 / %d12 / %d14-31 / %d127
; Non white space controls:
; US-ASCII control characters that do not include the
; carriage return, line feed, and white space characters
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| text | = |
%d1-9 / %d11 / %d12 / %d14-127 /
obs-text
; Characters excluding CR and LF
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| specials | = |
"("
/ ")"
/ "<"
/ ">"
/ "["
/ "]"
/ ":"
/ ";"
/ "@"
/ "\"
/ ","
/ "." / DQUOTE
; Special characters used in other parts of the syntax
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| quoted-pair | = |
("\"
text)
/ obs-qp
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| FWS | = |
([*WSP CRLF] 1*WSP) /
obs-FWS
; Folding white space
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| ctext | = |
NO-WS-CTL
/ %d33-39 / %d42-91 / %d93-126
; Non white space controls
; and the rest of the US-ASCII characters
; not including "(", ")", or "\"
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| ccontent | = |
ctext
/ quoted-pair
/ comment
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| comment | = |
"("
*([FWS]
ccontent)
[FWS]
")"
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| CFWS | = |
*([FWS]
comment)
(([FWS]
comment)
/ FWS)
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| atext | = |
ALPHA / DIGIT / "!"
/ "#"
/ "$"
/ "%"
/ "&"
/ "'"
/ "*"
/ "+"
/ "-"
/ "/"
/ "="
/ "?"
/ "^"
/ "_"
/ "`"
/ "{"
/ "|"
/ "}"
/ "~"
; Any character except controls, SP, and specials.
; Used for atoms
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| atom | = |
[CFWS]
1*atext
[CFWS]
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| dot-atom | = |
[CFWS]
dot-atom-text
[CFWS]
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| dot-atom-text | = |
1*atext
*("."
1*atext)
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| qtext | = |
NO-WS-CTL
/ %d33 / %d35-91 / %d93-126
; Non white space controls
; and the rest of the US-ASCII characters
; not including "\" or the quote character
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| qcontent | = |
qtext
/ quoted-pair
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| quoted-string | = |
[CFWS]
DQUOTE *([FWS]
qcontent)
[FWS] DQUOTE
[CFWS]
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| word | = |
atom
/ quoted-string
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| phrase | = |
1*word
/ obs-phrase
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| utext | = |
NO-WS-CTL
/ %d33-126 / obs-utext
; Non white space controls
; and the rest of the US-ASCII characters
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| unstructured | = |
*([FWS]
utext)
[FWS]
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| date-time | = |
[ day-of-week
"," ]
date FWS
time [CFWS]
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| day-of-week | = |
([FWS] day-name)
/ obs-day-of-week
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| day-name | = |
"Mon"
/ "Tue"
/ "Wed"
/ "Thu"
/ "Fri"
/ "Sat"
/ "Sun"
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| date | = |
day month year
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| year | = |
4*DIGIT / obs-year
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| month | = |
(FWS month-name FWS)
/ obs-month
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| month-name | = |
"Jan"
/ "Feb"
/ "Mar"
/ "Apr"
/ "May"
/ "Jun"
/ "Jul"
/ "Aug"
/ "Sep"
/ "Oct"
/ "Nov"
/ "Dec"
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| day | = |
([FWS] 1*2DIGIT)
/ obs-day
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| time | = |
time-of-day FWS
zone
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| time-of-day | = |
hour
":"
minute
[ ":"
second ]
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| minute | = |
2DIGIT / obs-minute
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| second | = |
2DIGIT / obs-second
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| hour | = |
2DIGIT / obs-hour
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| zone | = |
(( "+"
/ "-" ) 4DIGIT) /
obs-zone
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| address | = |
mailbox
/ group
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| mailbox | = |
name-addr
/ addr-spec
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| name-addr | = |
[display-name]
angle-addr
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| angle-addr | = |
[CFWS] "<"
addr-spec
">" [CFWS]
/ obs-angle-addr
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| group | = |
display-name
":"
[mailbox-list / CFWS]
";" [CFWS]
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| display-name | = |
phrase
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| mailbox-list | = |
(mailbox
*(","
mailbox))
/ obs-mbox-list
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| address-list | = |
(address
*(","
address))
/ obs-addr-list
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| addr-spec | = |
local-part
"@"
domain
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| local-part | = |
dot-atom / quoted-string
/ obs-local-part
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| domain | = |
dot-atom / domain-literal
/ obs-domain
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| domain-literal | = |
[CFWS] "["
*([FWS] dcontent) [FWS]
"]" [CFWS]
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| dcontent | = |
dtext / quoted-pair
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| dtext | = |
NO-WS-CTL / %d33-90 / %d94-126
; Non white space controls
; and the rest of the US-ASCII characters
; not including "[", "]", or "\"
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| message | = |
(fields
/ obs-fields)
[CRLF body]
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| body | = |
*(*998text CRLF) *998text
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| 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)
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| orig-date | = |
"Date:"
date-time CRLF
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| from | = |
"From:"
mailbox-list CRLF
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| sender | = |
"Sender:"
mailbox CRLF
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| reply-to | = |
"Reply-To:"
address-list CRLF
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| to | = |
"To:"
address-list CRLF
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| cc | = |
"Cc:"
address-list CRLF
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| bcc | = |
"Bcc:"
(address-list / [CFWS]) CRLF
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| message-id | = |
"Message-ID:"
msg-id CRLF
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| in-reply-to | = |
"In-Reply-To:"
1*msg-id CRLF
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| references | = |
"References:"
1*msg-id CRLF
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| msg-id | = |
[CFWS] "<"
id-left
"@"
id-right
">" [CFWS]
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| id-left | = |
dot-atom-text / no-fold-quote
/ obs-id-left
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| id-right | = |
dot-atom-text / no-fold-literal
/ obs-id-right
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| no-fold-quote | = |
DQUOTE *(qtext / quoted-pair) DQUOTE
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| no-fold-literal | = |
"[" *(dtext / quoted-pair)
"]"
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| subject | = |
"Subject:" unstructured CRLF
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| comments | = |
"Comments:" unstructured CRLF
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| keywords | = |
"Keywords:" phrase *(
"," phrase) CRLF
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| resent-date | = |
"Resent-Date:"
date-time CRLF
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| resent-from | = |
"Resent-From:"
mailbox-list CRLF
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| resent-sender | = |
"Resent-Sender:"
mailbox CRLF
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| resent-to | = |
"Resent-To:"
address-list CRLF
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| resent-cc | = |
"Resent-Cc:"
address-list CRLF
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| resent-bcc | = |
"Resent-Bcc:"
(address-list / [CFWS]) CRLF
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| resent-msg-id | = |
"Resent-Message-ID:"
msg-id CRLF
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| trace | = |
[return]
1*received
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| return | = |
"Return-Path:"
path CRLF
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| path | = |
([CFWS] "<"
([CFWS] / addr-spec)
">" [CFWS])
/ obs-path
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| received | = |
"Received:"
name-val-list CRLF
";"
date-time CRLF
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| name-val-list | = |
[CFWS] [name-val-pair
*(CFWS name-val-pair)]
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| name-val-pair | = |
item-name
CFWS item-value
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| item-name | = |
ALPHA *(["-"] (ALPHA / DIGIT))
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| item-value | = |
1*angle-addr
/ addr-spec / atom
/ domain
/ msg-id
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| optional-field | = |
field-name
":" unstructured CRLF
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| field-name | = |
1*ftext
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| ftext | = |
%d33-57 / %d59-126
; Any character except controls, SP, and ":"
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