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APPENDIX D. ALPHABETICAL LISTING OF SYNTAX RULES Connected: An Internet Encyclopedia
APPENDIX D. ALPHABETICAL LISTING OF SYNTAX RULES

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APPENDIX D. ALPHABETICAL LISTING OF SYNTAX RULES

APPENDIX D. ALPHABETICAL LISTING OF SYNTAX RULES

     address     =  mailbox                      ; one addressee
                 /  group                        ; named list
     addr-spec   =  local-part "@" domain        ; global address
     ALPHA       =  <any ASCII alphabetic character>
                                                 ; (101-132, 65.- 90.)
                                                 ; (141-172, 97.-122.)
     atom        =  1*<any CHAR except specials, SPACE and CTLs>
     authentic   =   "From"       ":"   mailbox  ; Single author
                 / ( "Sender"     ":"   mailbox  ; Actual submittor
                     "From"       ":" 1#mailbox) ; Multiple authors
                                                 ;  or not sender
     CHAR        =  <any ASCII character>        ; (  0-177,  0.-127.)
     comment     =  "(" *(ctext / quoted-pair / comment) ")"
     CR          =  <ASCII CR, carriage return>  ; (     15,      13.)
     CRLF        =  CR LF
     ctext       =  <any CHAR excluding "(",     ; => may be folded
                     ")", "\" & CR, & including
                     linear-white-space>
     CTL         =  <any ASCII control           ; (  0- 37,  0.- 31.)
                     character and DEL>          ; (    177,     127.)
     date        =  1*2DIGIT month 2DIGIT        ; day month year
                                                 ;  e.g. 20 Jun 82
     dates       =   orig-date                   ; Original
                   [ resent-date ]               ; Forwarded
     date-time   =  [ day "," ] date time        ; dd mm yy
                                                 ;  hh:mm:ss zzz
     day         =  "Mon"  / "Tue" /  "Wed"  / "Thu"
                 /  "Fri"  / "Sat" /  "Sun"
     delimiters  =  specials / linear-white-space / comment
     destination =  "To"          ":" 1#address  ; Primary
                 /  "Resent-To"   ":" 1#address
                 /  "cc"          ":" 1#address  ; Secondary
                 /  "Resent-cc"   ":" 1#address
                 /  "bcc"         ":"  #address  ; Blind carbon
                 /  "Resent-bcc"  ":"  #address
     DIGIT       =  <any ASCII decimal digit>    ; ( 60- 71, 48.- 57.)
     domain      =  sub-domain *("." sub-domain)
     domain-literal =  "[" *(dtext / quoted-pair) "]"
     domain-ref  =  atom                         ; symbolic reference
     dtext       =  <any CHAR excluding "[",     ; => may be folded
                     "]", "\" & CR, & including
                     linear-white-space>
     extension-field =
                   <Any field which is defined in a document
                    published as a formal extension to this
                    specification; none will have names beginning
                    with the string "X-">
     field       =  field-name ":" [ field-body ] CRLF
     fields      =    dates                      ; Creation time,
                      source                     ;  author id & one
                    1*destination                ;  address required
                     *optional-field             ;  others optional
     field-body  =  field-body-contents
                    [CRLF LWSP-char field-body]
     field-body-contents =
                   <the ASCII characters making up the field-body, as
                    defined in the following sections, and consisting
                    of combinations of atom, quoted-string, and
                    specials tokens, or else consisting of texts>
     field-name  =  1*<any CHAR, excluding CTLs, SPACE, and ":">
     group       =  phrase ":" [#mailbox] ";"
     hour        =  2DIGIT ":" 2DIGIT [":" 2DIGIT]
                                                 ; 00:00:00 - 23:59:59
     HTAB        =  <ASCII HT, horizontal-tab>   ; (     11,       9.)
     LF          =  <ASCII LF, linefeed>         ; (     12,      10.)
     linear-white-space =  1*([CRLF] LWSP-char)  ; semantics = SPACE
                                                 ; CRLF => folding
     local-part  =  word *("." word)             ; uninterpreted
                                                 ; case-preserved
     LWSP-char   =  SPACE / HTAB                 ; semantics = SPACE
     mailbox     =  addr-spec                    ; simple address
                 /  phrase route-addr            ; name & addr-spec
     message     =  fields *( CRLF *text )       ; Everything after
                                                 ;  first null line
                                                 ;  is message body
     month       =  "Jan"  /  "Feb" /  "Mar"  /  "Apr"
                 /  "May"  /  "Jun" /  "Jul"  /  "Aug"
                 /  "Sep"  /  "Oct" /  "Nov"  /  "Dec"
     msg-id      =  "<" addr-spec ">"            ; Unique message id
     optional-field =
                 /  "Message-ID"        ":"   msg-id
                 /  "Resent-Message-ID" ":"   msg-id
                 /  "In-Reply-To"       ":"  *(phrase / msg-id)
                 /  "References"        ":"  *(phrase / msg-id)
                 /  "Keywords"          ":"  #phrase
                 /  "Subject"           ":"  *text
                 /  "Comments"          ":"  *text
                 /  "Encrypted"         ":" 1#2word
                 /  extension-field              ; To be defined
                 /  user-defined-field           ; May be pre-empted
     orig-date   =  "Date"        ":"   date-time
     originator  =   authentic                   ; authenticated addr
                   [ "Reply-To"   ":" 1#address] )
     phrase      =  1*word                       ; Sequence of words

     qtext       =  <any CHAR excepting <">,     ; => may be folded
                     "\" & CR, and including
                     linear-white-space>
     quoted-pair =  "\" CHAR                     ; may quote any char
     quoted-string = <"> *(qtext/quoted-pair) <">; Regular qtext or
                                                 ;   quoted chars.
     received    =  "Received"    ":"            ; one per relay
                       ["from" domain]           ; sending host
                       ["by"   domain]           ; receiving host
                       ["via"  atom]             ; physical path
                      *("with" atom)             ; link/mail protocol
                       ["id"   msg-id]           ; receiver msg id
                       ["for"  addr-spec]        ; initial form
                        ";"    date-time         ; time received

     resent      =   resent-authentic
                   [ "Resent-Reply-To"  ":" 1#address] )
     resent-authentic =
                 =   "Resent-From"      ":"   mailbox
                 / ( "Resent-Sender"    ":"   mailbox
                     "Resent-From"      ":" 1#mailbox  )
     resent-date =  "Resent-Date" ":"   date-time
     return      =  "Return-path" ":" route-addr ; return address
     route       =  1#("@" domain) ":"           ; path-relative
     route-addr  =  "<" [route] addr-spec ">"
     source      = [  trace ]                    ; net traversals
                      originator                 ; original mail
                   [  resent ]                   ; forwarded
     SPACE       =  <ASCII SP, space>            ; (     40,      32.)
     specials    =  "(" / ")" / "<" / ">" / "@"  ; Must be in quoted-
                 /  "," / ";" / ":" / "\" / <">  ;  string, to use
                 /  "." / "[" / "]"              ;  within a word.
     sub-domain  =  domain-ref / domain-literal
     text        =  <any CHAR, including bare    ; => atoms, specials,
                     CR & bare LF, but NOT       ;  comments and
                     including CRLF>             ;  quoted-strings are
                                                 ;  NOT recognized.
     time        =  hour zone                    ; ANSI and Military
     trace       =    return                     ; path to sender
                    1*received                   ; receipt tags
     user-defined-field =
                   <Any field which has not been defined
                    in this specification or published as an
                    extension to this specification; names for
                    such fields must be unique and may be
                    pre-empted by published extensions>
     word        =  atom / quoted-string

     zone        =  "UT"  / "GMT"                ; Universal Time
                                                 ; North American : UT
                 /  "EST" / "EDT"                ;  Eastern:  - 5/ - 4
                 /  "CST" / "CDT"                ;  Central:  - 6/ - 5
                 /  "MST" / "MDT"                ;  Mountain: - 7/ - 6
                 /  "PST" / "PDT"                ;  Pacific:  - 8/ - 7
                 /  1ALPHA                       ; Military: Z = UT;
     <">         =  <ASCII quote mark>           ; (     42,      34.)


Connected: An Internet Encyclopedia
APPENDIX D. ALPHABETICAL LISTING OF SYNTAX RULES

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