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%%{
# RFC 5322 Internet Message Format
# https://tools.ietf.org/html/rfc5322
#
# RFC 6854 Update to Internet Message Format to Allow Group Syntax in the "From:" and "Sender:" Header Fields
# https://tools.ietf.org/html/rfc6854
machine rfc5322;
alphtype int;
include rfc5234_abnf_core_rules "rfc5234_abnf_core_rules.rl";
# 3.2. Lexical Tokens
include rfc5322_lexical_tokens "rfc5322_lexical_tokens.rl";
# 3.3. Date and Time Specification
include rfc5322_date_time "rfc5322_date_time.rl";
# 3.4. Address Specification
include rfc5322_address "rfc5322_address.rl";
# 3.5. Overall Message Syntax
#rfc5322_text = 0x01..0x09 | "\v" | "\f" | 0x0e..0x1f;
#text = rfc5322_text | utf8_non_ascii; # RFC6532 for UTF-8
#obs_body = ((LF* CR* ((0x00 | text) LF* CR*)*) | CRLF)*
#body = ((text{,998} CRLF)* text{,998}) | obs_body;
#message = (fields | obs_fields) (CRLF body)?;
# 3.6. Field Definitions
# 3.6.4. Identification Fields
obs_id_left = local_part;
id_left = dot_atom_text | obs_id_left;
# id_right modifications to support multiple '@' in msg_id.
msg_id_atext = ALPHA | DIGIT | "!" | "#" | "$" | "%" | "&" | "'" | "*" |
"+" | "-" | "/" | "=" | "?" | "^" | "_" | "`" | "{" | "|" |
"}" | "~" | "@";
msg_id_dot_atom_text = (msg_id_atext+ "."?)+;
obs_id_right = domain;
no_fold_literal = "[" (dtext)* "]";
id_right = msg_id_dot_atom_text | no_fold_literal | obs_id_right;
msg_id = (CFWS)?
(("<" id_left "@" id_right ">") >msg_id_s %msg_id_e)
(CFWS)?;
message_ids = msg_id (CFWS? msg_id)*;
# 3.6.7 Trace Fields
# Added CFWS? to increase robustness (qmail likes to include a comment)
received_token = word | angle_addr | addr_spec_no_angle_brackets | domain;
received = ((CFWS? received_token*) >received_tokens_s %received_tokens_e)
";" date_time;
# Envelope From
ctime_date = day_name " "+ month " "+ day " " time_of_day " " year;
null_sender = ('<>' ' '{0,1});
envelope_from = (addr_spec_no_angle_brackets | null_sender) >address_s %address_e " "
(ctime_date >ctime_date_s %ctime_date_e);
}%%
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