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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<title>The BNF from RFC 5322 defining parts of a valid internet message address</title>
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<pre style="font-size:11px;">
addr-spec = local-part "@" domain
local-part = dot-atom / quoted-string / obs-local-part
dot-atom = [CFWS] dot-atom-text [CFWS]
CFWS = (1*([FWS] comment) [FWS]) / FWS
FWS = ([*WSP CRLF] 1*WSP) / obs-FWS
; Folding white space
WSP = SP / HTAB ; white space
obs-FWS = 1*([CRLF] WSP) ; As amended in erratum #1908
ctext = %d33-39 / ; Printable US-ASCII
%d42-91 / ; characters not including
%d93-126 / ; "(", ")", or "\"
obs-ctext
obs-ctext = obs-NO-WS-CTL
ccontent = ctext / quoted-pair / comment
comment = "(" *([FWS] ccontent) [FWS] ")"
dot-atom-text = 1*atext *("." 1*atext)
atext = ALPHA / DIGIT / ; Printable US-ASCII
"!" / "#" / ; characters not including
"$" / "%" / ; specials. Used for atoms.
"&" / "'" /
"*" / "+" /
"-" / "/" /
"=" / "?" /
"^" / "_" /
"`" / "{" /
"|" / "}" /
"~"
specials = "(" / ")" / ; Special characters that do
"<" / ">" / ; not appear in atext
"[" / "]" /
":" / ";" /
"@" / "\" /
"," / "." /
DQUOTE
quoted-string = [CFWS]
DQUOTE *([FWS] qcontent) [FWS] DQUOTE
[CFWS]
qcontent = qtext / quoted-pair
qtext = %d33 / ; Printable US-ASCII
%d35-91 / ; characters not including
%d93-126 / ; "\" or the quote character
obs-qtext
obs-qtext = obs-NO-WS-CTL
obs-NO-WS-CTL = %d1-8 / ; US-ASCII control
%d11 / ; characters that do not
%d12 / ; include the carriage
%d14-31 / ; return, line feed, and
%d127 ; white space characters
quoted-pair = ("\" (VCHAR / WSP)) / obs-qp
VCHAR = %x21-7E ; visible (printing) characters
obs-qp = "\" (%d0 / obs-NO-WS-CTL / LF / CR)
obs-local-part = word *("." word)
word = atom / quoted-string
atom = [CFWS] 1*atext [CFWS]
domain = dot-atom / domain-literal / obs-domain
domain-literal = [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
dtext = %d33-90 / ; Printable US-ASCII
%d94-126 / ; characters not including
obs-dtext ; "[", "]", or "\"
obs-dtext = obs-NO-WS-CTL / quoted-pair
obs-domain = atom *("." atom)
NB For SMTP mail, the domain-literal is restricted by RFC5321 as follows:
Mailbox = Local-part "@" ( Domain / address-literal )
address-literal = "[" ( IPv4-address-literal /
IPv6-address-literal /
General-address-literal ) "]"
IPv4-address-literal = Snum 3("." Snum)
IPv6-address-literal = "IPv6:" IPv6-addr
Snum = 1*3DIGIT
; representing a decimal integer
; value in the range 0 through 255
IPv6-addr = IPv6-full / IPv6-comp / IPv6v4-full / IPv6v4-comp
IPv6-hex = 1*4HEXDIG
IPv6-full = IPv6-hex 7(":" IPv6-hex)
IPv6-comp = [IPv6-hex *5(":" IPv6-hex)] "::"
[IPv6-hex *5(":" IPv6-hex)]
; The "::" represents at least 2 16-bit groups of
; zeros. No more than 6 groups in addition to the
; "::" may be present.
IPv6v4-full = IPv6-hex 5(":" IPv6-hex) ":" IPv4-address-literal
IPv6v4-comp = [IPv6-hex *3(":" IPv6-hex)] "::"
[IPv6-hex *3(":" IPv6-hex) ":"]
IPv4-address-literal
; The "::" represents at least 2 16-bit groups of
; zeros. No more than 4 groups in addition to the
; "::" and IPv4-address-literal may be present.
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