rfc0822 says this about the lexicon of email addresses address = mailbox ; one addressee / group ; named list group = phrase ":" [#mailbox] ";" mailbox = addr-spec ; simple address / phrase route-addr ; name & addr-spec route-addr = "<" [route] addr-spec ">" route = 1#("@" domain) ":" ; path-relative addr-spec = local-part "@" domain ; global address local-part = word *("." word) ; uninterpreted ; case-preserved domain = sub-domain *("." sub-domain) sub-domain = domain-ref / domain-literal domain-ref = atom ; symbolic reference ; ( Octal, Decimal.) CHAR = <any ASCII character> ; ( 0-177, 0.-127.) ALPHA = <any ASCII alphabetic character> ; (101-132, 65.- 90.) ; (141-172, 97.-122.) DIGIT = <any ASCII decimal digit> ; ( 60- 71, 48.- 57.) CTL = <any ASCII control ; ( 0- 37, 0.- 31.) character and DEL> ; ( 177, 127.) CR = <ASCII CR, carriage return> ; ( 15, 13.) LF = <ASCII LF, linefeed> ; ( 12, 10.) SPACE = <ASCII SP, space> ; ( 40, 32.) HTAB = <ASCII HT, horizontal-tab> ; ( 11, 9.) <"> = <ASCII quote mark> ; ( 42, 34.) CRLF = CR LF LWSP-char = SPACE / HTAB ; semantics = SPACE linear-white-space = 1*([CRLF] LWSP-char) ; semantics = SPACE ; CRLF => folding specials = "(" / ")" / "<" / ">" / "@" ; Must be in quoted- / "," / ";" / ":" / "\" / <"> ; string, to use / "." / "[" / "]" ; within a word. delimiters = specials / linear-white-space / comment text = <any CHAR, including bare ; => atoms, specials, CR & bare LF, but NOT ; comments and including CRLF> ; quoted-strings are ; NOT recognized. atom = 1*<any CHAR except specials, SPACE and CTLs> quoted-string = <"> *(qtext/quoted-pair) <">; Regular qtext or ; quoted chars. qtext = <any CHAR excepting <">, ; => may be folded "\" & CR, and including linear-white-space> domain-literal = "[" *(dtext / quoted-pair) "]" dtext = <any CHAR excluding "[", ; => may be folded "]", "\" & CR, & including linear-white-space> comment = "(" *(ctext / quoted-pair / comment) ")" ctext = <any CHAR excluding "(", ; => may be folded ")", "\" & CR, & including linear-white-space> quoted-pair = "\" CHAR ; may quote any char phrase = 1*word ; Sequence of words word = atom / quoted-string
file: /Techref/inet/emailaddr.htm, 3KB, , updated: 2003/4/24 09:54, local time: 2024/12/24 23:11,
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