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Progress. I've decided to properly handle it by the ABNF book, so we're rewriting the world.

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This commit is contained in:
Andrew Pietila 2025-01-26 23:31:23 -06:00
parent c93c2fa8c8
commit c774cb1db5
6 changed files with 653 additions and 9 deletions
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167
lib/FromMimeHeader.js Normal file
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@ -0,0 +1,167 @@
import MimeHeader from "./MimeHeader.js";
const atext = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!#$%&'*+-/=?^_`{|}~".split('');
const dtext = "!\"#$%^&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ^_`abcdefghijklmnopqrstuvwxyz{|}~".split('');
const qtext = "!#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~".split('');
class FromMimeHeader extends MimeHeader {
constructor(key, value) {
super(key, value);
this._fromValue = [];
}
// From: Andrew Pietila <a.pietila@protonmail.com>
get fromValue() {
// ABNF:
// from = "From:" mailbox-list CRLF
// mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
// mailbox = name-addr / addr-spec
// name-addr = [display-name] angle-addr
// display-name = phrase
// phrase = 1*word / obs-phrase
// word = atom / quoted-string
// atom = [CFWS] 1*atext [CFWS]
// addr-spec = local-part "@" domain
// local-part = dot-atom / quoted-string / obs-local-part
// 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 "\"
// dot-atom-text = 1*atext *("." 1*atext)
// dot-atom = [CFWS] dot-atom-text [CFWS]
// 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
// TODO: Implement utf-8 encoding and whatever other encodings we have to support.
if ( this._fromValue.length !== 0 ) {
return this._fromValue;
}
// TODO: Implement this state machine properly according to the above ABNF.
var from = [];
var state = "";
var inCRLF = false;
var commentDepth = 0;
var displayName = "";
var inDquot = false;
var idLeft = "";
var idRight = "";
var idRightDatEmittedRightSquacket = false;
for (var char of this.rawValue) {
if ( inCRLF === true && char !== "\n" ) {
return null; // Error state.
}
if (state === "") {
// CFWS
if ( char === " ") {
continue;
} else if ( char === "\t") {
continue;
} else if ( char === "(" && !inDquot ) {
commentDepth++;
} else if ( char === "\"" ) {
inDquot = !inDquot;
} else if ( char === ")" && !inDquot ) {
commentDepth--;
} else if ( char === "\r" ) {
inCRLF = true;
} else if ( char === "\n" ) {
inCRLF = false;
} else {
state = "display-name";
}
} else if ( state === "display-name") {
if ( char === " " ) {
if ( state.endsWith(" ") ) {
continue;
} else {
}
}
}
// else if ( char === "<" ) {
// state = "id-left";
// } else {
// return null; // Error state, we couldn't produce a proper message ID from the input.
// }
// } else if ( state === "id-left" ) {
// if ( atext.includes(char) ) {
// idLeft += char;
// } else if ( char === "." ) {
// if ( idLeft.endsWith(".") || idLeft.length === 0 ) {
// return null; // Error state.
// }
// idLeft += char;
// } else if ( char === "@" ) {
// if ( idLeft.endsWith(".") || idLeft.length === 0) {
// return null; // Error state.
// }
// state = "id-right";
// }
// } else if ( state === "id-right" ) {
// if ( char === "[" ) {
// if ( idRight.length !== 0 ) {
// return null; // Error state.
// }
// idRight += char;
// state = "id-right-dat";
// } else if ( char === "." ) {
// if ( idRight.endsWith(".") || idRight.length === 0 ) {
// return null; // Error state.
// }
// idRight += char;
// } else if ( char === ">" ) {
// if ( idRight.endsWith(".") || idRight.length === 0) {
// return null; // Error state.
// }
// state = "end-cfws"
// }
// } else if ( state === "id-right-dat" ) {
// if ( char === ">" && idRight.endsWith("]") ) {
// state = "end-cfws";
// continue;
// }
// if ( dtext.includes(char) ) {
// if ( idRightDatEmittedRightSquacket ) {
// return null; // Error state.
// }
// idRight += char;
// } else if ( char === "]" ) {
// if ( idRightDatEmittedRightSquacket ) {
// return null; // Error state.
// }
// idRight += char;
// idRightDatEmittedRightSquacket = true;
// }
// } else if ( state === "end-cfws" ) {
// // CFWS
// if ( char === " ") {
// continue;
// } else if ( char === "\t") {
// continue;
// } else if ( char === "(" && !inDquot ) {
// commentDepth++;
// } else if ( char === "\"" ) {
// inDquot = !inDquot;
// } else if ( char === ")" && !inDquot ) {
// commentDepth--;
// } else if ( char === "\r" ) {
// inCRLF = true;
// } else if ( char === "\n" ) {
// inCRLF = false;
// } else {
// return null; // Error state.
// }
// }
}
this._fromValue = from;
return `${idLeft}@${idRight}`;
}
}
export default FromMimeHeader;

7
lib/InReplyToMimeHeader.js
View file

@ -6,7 +6,7 @@ const dtext = "!\"#$%^&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ^_`ab
class InReplyToMimeHeader extends MimeHeader {
constructor(key, value) {
super(key, value);
this._messageIdValue = "";
this._inReplyToValue = [];
}
// Message-ID: <0Q27kpOFnz1MK3ASM_vbjI8L_BYN3j5OSxIaGxerST74zBn7VZfqCowbhEWgJ0Yv4mV847u25YGjENqlsM7-15Zdus90qN7t_kj55FyuN_c=@protonmail.com>
get inReplyToValues() {
@ -48,8 +48,8 @@ class InReplyToMimeHeader extends MimeHeader {
// %d14-31 / ; return, line feed, and
// %d127 ; white space characters
// TODO: Implement utf-8 encoding and whatever other encodings we have to support.
if ( this._messageIdValue !== undefined ) {
return this._messageIdValue;
if ( this._inReplyToValue.length !== 0 ) {
return this._inReplyToValue;
}
// TODO: Implement this state machine properly according to the above ABNF.
var inReplyTo = [];
@ -161,6 +161,7 @@ class InReplyToMimeHeader extends MimeHeader {
}
}
this._inReplyToValue = inReplyTo;
return inReplyTo;
}
}

3
lib/MessageIdMimeHeader.js
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@ -51,7 +51,7 @@ class MessageIdMimeHeader extends MimeHeader {
// %d14-31 / ; return, line feed, and
// %d127 ; white space characters
// TODO: Implement utf-8 encoding and whatever other encodings we have to support.
if ( this._messageIdValue !== undefined ) {
if ( this._messageIdValue !== "" ) {
return this._messageIdValue;
}
// TODO: Implement this state machine properly according to the above ABNF.
@ -158,6 +158,7 @@ class MessageIdMimeHeader extends MimeHeader {
}
}
this._messageIdValue = `${idLeft}@${idRight}`;
return `${idLeft}@${idRight}`;
}
}

168
lib/ReferencesMimeHeader.js Normal file
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@ -0,0 +1,168 @@
import MimeHeader from "./MimeHeader.js";
const atext = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!#$%&'*+-/=?^_`{|}~".split('');
const dtext = "!\"#$%^&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ^_`abcdefghijklmnopqrstuvwxyz{|}~".split('');
class ReferencesMimeHeader extends MimeHeader {
constructor(key, value) {
super(key, value);
this._referencesValue = [];
}
// Message-ID: <0Q27kpOFnz1MK3ASM_vbjI8L_BYN3j5OSxIaGxerST74zBn7VZfqCowbhEWgJ0Yv4mV847u25YGjENqlsM7-15Zdus90qN7t_kj55FyuN_c=@protonmail.com>
get referencesValues() {
// ABNF:
// references = "References:" 1*msg-id CRLF
// msg-id = [CFWS] "<" id-left "@" id-right ">" [CFWS]
// id-left = dot-atom-text / obs-id-left
// obs-id-left = local-part
// id-right = dot-atom-text / no-fold-literal / obs-id-right
// obs-id-right = domain
// no-fold-literal = "[" *dtext "]"
// dtext = %d33-90 / ; Printable US-ASCII
// %d94-126 / ; characters not including
// obs-dtext ; "[", "]", or "\"
// dot-atom-text = 1*atext *("." 1*atext)
// atext = ALPHA / DIGIT / ; Printable US-ASCII
// "!" / "#" / ; characters not including
// "$" / "%" / ; specials. Used for atoms.
// "&" / "'" /
// "*" / "+" /
// "-" / "/" /
// "=" / "?" /
// "^" / "_" /
// "`" / "{" /
// "|" / "}" /
// "~"
// dtext = %d33-90 / ; Printable US-ASCII
// %d94-126 / ; characters not including
// obs-dtext ; "[", "]", or "\"
// comment = "(" *([FWS] ccontent) [FWS] ")"
// ccontent = ctext / quoted-pair / comment
// WSP = SP / HTAB ; white space
// obs-FWS = 1*WSP *(CRLF 1*WSP)
// quoted-pair = ("\" (VCHAR / WSP)) / obs-qp
// obs-qp = "\" (%d0 / obs-NO-WS-CTL / LF / CR)
// 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
// TODO: Implement utf-8 encoding and whatever other encodings we have to support.
if ( this._referencesValue.length !== 0 ) {
return this._referencesValue;
}
// TODO: Implement this state machine properly according to the above ABNF.
var references = [];
var state = "";
var inCRLF = false;
var commentDepth = 0;
var inDquot = false;
var idLeft = "";
var idRight = "";
var idRightDatEmittedRightSquacket = false;
for (var char of this.rawValue) {
if ( inCRLF === true && char !== "\n" ) {
return null; // Error state.
}
if (state === "") {
// CFWS
if ( char === " ") {
continue;
} else if ( char === "\t") {
continue;
} else if ( char === "(" && !inDquot ) {
commentDepth++;
} else if ( char === "\"" ) {
inDquot = !inDquot;
} else if ( char === ")" && !inDquot ) {
commentDepth--;
} else if ( char === "\r" ) {
inCRLF = true;
} else if ( char === "\n" ) {
inCRLF = false;
} else if ( char === "<" ) {
state = "id-left";
} else {
return null; // Error state, we couldn't produce a proper message ID from the input.
}
} else if ( state === "id-left" ) {
if ( atext.includes(char) ) {
idLeft += char;
} else if ( char === "." ) {
if ( idLeft.endsWith(".") || idLeft.length === 0 ) {
return null; // Error state.
}
idLeft += char;
} else if ( char === "@" ) {
if ( idLeft.endsWith(".") || idLeft.length === 0) {
return null; // Error state.
}
state = "id-right";
}
} else if ( state === "id-right" ) {
if ( char === "[" ) {
if ( idRight.length !== 0 ) {
return null; // Error state.
}
idRight += char;
state = "id-right-dat";
} else if ( char === "." ) {
if ( idRight.endsWith(".") || idRight.length === 0 ) {
return null; // Error state.
}
idRight += char;
} else if ( char === ">" ) {
if ( idRight.endsWith(".") || idRight.length === 0) {
return null; // Error state.
}
references.push(`${idLeft}@${idRight}`);
idLeft = "";
idRight = "";
state = "intermediate-or-end-cfws"
}
} else if ( state === "id-right-dat" ) {
if ( char === ">" && idRight.endsWith("]") ) {
state = "intermediate-or-end-cfws";
continue;
}
if ( dtext.includes(char) ) {
if ( idRightDatEmittedRightSquacket ) {
return null; // Error state.
}
idRight += char;
} else if ( char === "]" ) {
if ( idRightDatEmittedRightSquacket ) {
return null; // Error state.
}
idRight += char;
idRightDatEmittedRightSquacket = true;
}
} else if ( state === "intermediate-or-end-cfws" ) {
// CFWS
if ( char === " ") {
continue;
} else if ( char === "\t") {
continue;
} else if ( char === "(" && !inDquot ) {
commentDepth++;
} else if ( char === "\"" ) {
inDquot = !inDquot;
} else if ( char === ")" && !inDquot ) {
commentDepth--;
} else if ( char === "\r" ) {
inCRLF = true;
} else if ( char === "\n" ) {
inCRLF = false;
} else if ( char === "<" ) {
state = "id-left";
} else {
return null; // Error state.
}
}
}
return references;
}
}
export default ReferencesMimeHeader;

306
mimetest.js Normal file
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@ -0,0 +1,306 @@
import fs from 'node:fs';
const validMime = fs.readFileSync("/home/rallias/Dev/andrewpietiladotcom/messageStore/1.eml", "utf-8");
// TODO: Does this actually need to throw internally?
class ABNFNoMatchError extends Error {}
class ABNFResult {
constructor(value, subTokens, type, startChar, endChar) {
this._value = value;
this._subTokens = subTokens;
this._type = type;
this._startChar = startChar;
this._endChar = endChar;
}
}
function parseCRLF(chars, ptr) {
// RFC 5234 B.1
// CRLF = CR LF
// ; Internet standard newline
if ( chars[ptr] === String.fromCharCode(0x0D) && chars[ptr+1] === String.fromCharCode(0x0A) ) {
return new ABNFResult(chars[ptr]+chars[ptr+1], null, "CRLF", ptr, ptr+1);
} else {
throw new ABNFNoMatchError();
}
}
function parseWSP(chars, ptr) {
// RFC 5234 B.1
// WSP = SP / HTAB
// ; white space
if ( chars[ptr] === String.fromCharCode(0x20) ) {
return new ABNFResult(chars[ptr], null, "WSP", ptr, ptr);
} else if ( chars[ptr] === String.fromCharCode(0x09)) {
return new ABNFResult(chars[ptr], null, "WSP", ptr, ptr);
} else {
throw new ABNFNoMatchError();
}
}
function parseQuotedPair(chars, ptr) {
// RFC 5322 3.2.1
// quoted-pair = ("\" (VCHAR / WSP)) / obs-qp
// TODO: Handle obs-qp
if ( chars[ptr] === "\\" && chars[ptr+1] === "\"" ) {
return new ABNFResult("\\\"", null, "quoted-pair", ptr, ptr+1);
} else {
throw new ABNFNoMatchError();
}
}
function parseFWS(chars, ptr) {
// RFC 5322 3.2.2
// FWS = ([*WSP CRLF] 1*WSP) / obs-FWS
// ; Folding white space
// TODO: Handle obs-FWS
var startChar = ptr;
var value = "";
var subTokens = [];
var inFWS = true;
while(inFWS) {
try {
var wsp = parseWSP(chars, ptr);
subTokens.push(wsp);
value += wsp._value;
ptr = wsp._endChar + 1;
} catch(e) {
try {
var crlf = parseCRLF(chars, ptr);
subTokens.push(crlf);
value += crlf._value;
ptr = crlf._endChar + 1;
} catch(e) {
inFWS = false;
}
}
if ( inFWS && subTokens.length > 1 && !(subTokens[subTokens.length-1]._type === "CRLF" && subTokens[subTokens.length-2]._type === "CRLF")) {
throw new ABNFNoMatchError();
}
}
if ( subTokens[subTokens.length-1]._type === "CRLF" ) {
throw new ABNFNoMatchError();
}
return new ABNFResult(value, subTokens, "FWS", startChar, ptr);
}
const ctextChars = "!\"#$%&'*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~".split("");
function parseCtext(chars, ptr) {
// RFC 5322 3.2.2
// ctext = %d33-39 / ; Printable US-ASCII
// %d42-91 / ; characters not including
// %d93-126 / ; "(", ")", or "\"
// obs-ctext
// TODO: handle obs-ctext
if ( ctextChars.includes(chars[ptr]) ) {
return new ABNFResult(chars[ptr], null, "ctext", ptr, ptr);
} else {
throw new ABNFNoMatchError();
}
}
// Help the typescript parser understand heads from tails.
/**
* @param {String[]} chars
* @param {Number} ptr
* @returns {ABNFResult}
* @throws {ABNFNoMatchError}
*/
function parseCcontent(chars, ptr) {
// RFC 5322 3.2.2
// ccontent = ctext / quoted-pair / comment
try {
var ctext = parseCtext(chars, ptr);
return new ABNFResult(ctext._value, ctext, "ccontent", ctext._startChar, ctext._endChar);
} catch(e) {
try {
var quotedPair = parseQuotedPair(chars, ptr);
return new ABNFResult(quotedPair._value, quotedPair, "ccontent", quotedPair._startChar, quotedPair._endChar);
} catch(e) {
try {
var comment = parseComment(chars, ptr);
return new ABNFResult(comment._value, comment, "ccontent", comment._startChar, comment._endChar);
} catch(e) {
}
}
}
throw new ABNFNoMatchError();
}
function parseComment(chars, ptr) {
// RFC 5322 3.2.2
// comment = "(" *([FWS] ccontent) [FWS] ")"
var startChar = ptr;
var value = "";
var subTokens = [];
if ( chars[ptr] === "(" ) {
value += chars[ptr];
ptr++;
var inLoop = true;
while(inLoop) {
try {
var fws = parseFWS(chars, ptr);
subTokens.push(fws);
value += fws._value;
ptr = fws._endChar + 1;
} catch(e) {
try {
var ccontent = parseCcontent(chars, ptr);
subTokens.push(ccontent);
value += ccontent._value;
ptr = ccontent._endChar + 1;
} catch(e) {
inLoop = false;
}
}
}
try {
var fws = parseFWS(chars, ptr);
subTokens.push(fws);
value += fws._value;
ptr = fws._endChar + 1;
} catch(e) {
// FWS is optional.
}
if ( chars[ptr] === ")" ) {
value += chars[ptr];
return new ABNFResult(value, subTokens, "comment", startChar, ptr);
}
}
throw new ABNFNoMatchError();
}
function parseCFWS(chars, ptr) {
// RFC 5322 3.2.2
// CFWS = (1*([FWS] comment) [FWS]) / FWS
var startChar = ptr;
var value = "";
var subTokens = [];
var inCFWS = true;
while(inCFWS) {
try {
var fws = parseFWS(chars, ptr);
subTokens.push(fws);
value += fws._value;
ptr = fws._endChar + 1;
} catch(e) {
try {
var comment = parseComment(chars, ptr);
subTokens.push(comment);
value += comment._value;
ptr = comment._endChar + 1;
} catch(e) {
inCFWS = false;
}
}
}
if ( subTokens.length >= 1 ) {
return new ABNFResult(value, subTokens, "CFWS", startChar, ptr);
}
throw new ABNFNoMatchError();
}
const atextChars = "ABCDEFGHIJKLMNOPQRSTUVWXYabcdefghijklmnopqrstuvwxy012345678!#$%&'*+-/=?^_`{|}~".split('');
function parseAtext(chars, ptr) {
// RFC 5322 3.2.3
// atext = ALPHA / DIGIT / ; Printable US-ASCII
// "!" / "#" / ; characters not including
// "$" / "%" / ; specials. Used for atoms.
// "&" / "'" /
// "*" / "+" /
// "-" / "/" /
// "=" / "?" /
// "^" / "_" /
// "`" / "{" /
// "|" / "}" /
// "~"
if ( atextChars.includes(chars[ptr]) ) {
return new ABNFResult(chars[ptr], null, "atext", ptr, ptr);
} else {
throw new ABNFNoMatchError();
}
}
function parseAtom(chars, ptr) {
// RFC 5322 3.2.3
// atom = [CFWS] 1*atext [CFWS]
var startChar = ptr;
var value = "";
var subTokens = [];
var inAtom = true;
try {
var cfws = parseCFWS(chars, ptr);
subTokens.push(cfws);
value += cfws._value;
ptr = cfws._endChar + 1;
} catch(e) {
// Optional.
}
while (inAtom) {
try {
var atext = parseAtext(chars, ptr);
subTokens.push(atext);
value += atext._value;
ptr = atext._value + 1;
} catch(e) {
inAtom = false;
}
}
if ( subTokens[subTokens.length-1]._type != "atext" ) {
throw new ABNFNoMatchError();
}
try {
var cfws = parseCFWS(chars, ptr);
subTokens.push(cfws);
value += cfws._value;
ptr = cfws._endChar + 1;
} catch(e) {
// Optional.
}
return new ABNFResult(value, subTokens, "atom", startChar, ptr);
}
function parseDotAtomText(chars, ptr) {
// RFC 5322 3.2.3
// dot-atom-text = 1*atext *("." 1*atext)
var startChar = ptr;
var value = "";
var subTokens = [];
var inDAT = true;
while (inDAT) {
try {
var atext = parseAtext(chars, ptr);
subTokens.push(atext);
value += atext._value;
ptr = atext._value + 1;
} catch(e) {
// We fish later.
}
if ( chars[ptr] === "." && value === "" ) {
throw new ABNFNoMatchError();
}
if ( chars[ptr] === "." ) {
value += ".";
ptr++;
}
}
if ( value.endsWith(".") ) {
throw new ABNFNoMatchError();
}
// TODO: Do we care with granularity about the dots and their positions?
return new ABNFResult(value, subTokens, "dot-atom-text", startChar, ptr);
}

11
server.js
View file

@ -56,11 +56,11 @@ app.post('/sendgrid/ingress', (req, res) => {
var envelope = JSON.parse(fields.envelope?.[0]??"{}");
dns.reverse(typeof req.headers["x-forwarded-for"] === "string" ? req.headers["x-forwarded-for"] : "192.0.2.0", (err, dnsRes) => {
dns.reverse(typeof req.headers["x-forwarded-for"] === "string" ? req.headers["x-forwarded-for"] : "192.0.2.0", async (err, dnsRes) => {
if (err)
messageObj.prependHeader(new MimeHeader(`Received: from ${req.headers["x-forwarded-for"]} by andrewpietila.com with HTTPS-API id ${state} for ${envelope.to ?? "unknown"}; ${new Date().toISOString()}`));
messageObj.prependHeader(new MimeHeader(`Received: from ${req.headers["x-forwarded-for"]} by andrewpietila.com with HTTPS-API id ${state} for <${envelope.to ?? "unknown"}>; ${new Date().toString()}`));
else
messageObj.prependHeader(new MimeHeader(`Received: from ${dnsRes[0]} (${dnsRes[0]} [${req.headers["x-forwarded-for"]}] by andrewpietila.com with HTTPS-API id ${state} for ${envelope.to ?? "unknown"}; ${new Date().toISOString()}`));
messageObj.prependHeader(new MimeHeader(`Received: from ${dnsRes[0]} (${dnsRes[0]} [${req.headers["x-forwarded-for"]}] by andrewpietila.com with HTTPS-API id ${state} for <${envelope.to ?? "unknown"}>; ${new Date().toString()}`));
messageObj.prependHeader(new MimeHeader(`X-Auth-Check: SPF ${fields.SPF?.[0] ?? "missing"}`));
messageObj.prependHeader(new MimeHeader(`X-Auth-Check: DKIM ${fields.dkim?.[0] ?? "missing"}`));
messageObj.prependHeader(new MimeHeader(`Return-Path: <${envelope.from ?? "unknown"}>`));
@ -241,8 +241,9 @@ app.post("/api/jmap/api/", bodyParser.json(), async (req, res) => {
// blobId: state
// mailboxIds: {INBOX: true} // TODO: Implement more mailboxes.
// keywords: keywords table, {keyword_column: true}
// messageId: new MimeMessage().getFirstHeaderOf("Message-Id").messageIdValue
// inReplyTo: new MimeMessage().getFirstHeadderOf("In-Reply-To").inReplyToValues
// messageId: new MimeMessage().getFirstHeaderOf("Message-Id").messageIdValue()
// inReplyTo: new MimeMessage().getFirstHeadderOf("In-Reply-To").inReplyToValues()
// references: new MimeMessage().getFirstHeaderOf("References").referencesValues()
return [
"error",