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%%{
machine smtp_address;
# SMTP address spec
# Obtained from: https://tools.ietf.org/html/rfc5321#section-4.1.2
QcontentSMTP = qtextSMTP | quoted_pairSMTP %User_has_backslash;
Quoted_string = ( DQUOTE QcontentSMTP* >User_start %User_end DQUOTE ) %Quoted_addr;
Local_part = Dot_string >User_start %User_end | Quoted_string;
String = Atom | Quoted_string;
Standardized_tag = Ldh_str;
General_address_literal = Standardized_tag ":" dcontent+;
address_literal = "[" ( IPv4_address_literal |
IPv6_address_literal |
General_address_literal ) >Domain_addr_start %Domain_addr_end "]";
non_conformant_address_literal = IPv4_address_literal >Domain_addr_start %Domain_addr_end;
sub_domain = Let_dig Ldh_str?;
Domain = sub_domain ("." sub_domain)*;
Atdomain = "@" Domain;
Adl = Atdomain ( "," Atdomain )*;
Mailbox = Local_part "@" (address_literal | Domain >Domain_start %Domain_end);
UnangledPath = ( Adl ":" )? Mailbox >Addr_start %Addr_end "."?;
AngledPath = "<" UnangledPath ">" %Addr_has_angle;
Path = AngledPath | UnangledPath;
SMTPAddr = space* (Path | "<>" %Empty_addr ) %Valid_addr space*;
}%%
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