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<title>The BNF from RFC 5321 defining parts of a valid SMTP address</title>
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   Mailbox        = Local-part "@" ( Domain / address-literal )

Local-part     = Dot-string / Quoted-string
                  ; MAY be case-sensitive

Dot-string     = Atom *("."  Atom)

Atom           = 1*atext

Quoted-string  = DQUOTE *QcontentSMTP DQUOTE

QcontentSMTP   = qtextSMTP / quoted-pairSMTP

quoted-pairSMTP  = %d92 %d32-126
                    ; i.e., backslash followed by any ASCII
                    ; graphic (including itself) or SPace

qtextSMTP      = %d32-33 / %d35-91 / %d93-126
                  ; i.e., within a quoted string, any
                  ; ASCII graphic or space is permitted
                  ; without blackslash-quoting except
                  ; double-quote and the backslash itself.

Domain         = sub-domain *("." sub-domain)

sub-domain     = Let-dig [Ldh-str]

Let-dig        = ALPHA / DIGIT

Ldh-str        = *( ALPHA / DIGIT / "-" ) Let-dig

address-literal  = "[" ( IPv4-address-literal /
                    IPv6-address-literal /
                    General-address-literal ) "]"
                    ; See Section 4.1.3

IPv4-address-literal  = Snum 3("."  Snum)

IPv6-address-literal  = "IPv6:" IPv6-addr

General-address-literal  = Standardized-tag ":" 1*dcontent

Standardized-tag  = Ldh-str
                     ; Standardized-tag MUST be specified in a
                     ; Standards-Track RFC and registered with IANA

dcontent       = %d33-90 / ; Printable US-ASCII
                  %d94-126 ; excl. "[", "\", "]"

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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