I have build a module that generates a very unique Message-Id, but I've been asked to shorten it, so I wonder how short I can make it, so it is still RFC 2822 valid and will not get caught in spam filters.
I see Python generates one that is about 41 chars long, which seems a bit too short.
Any suggestions?
'use strict';
var crypto = require('crypto');
// inspired by http://www.jwz.org/doc/mid.html#3
module.exports = function (hostname) {
var hrtime = process.hrtime();
var microseconds = hrtime[0] * 1000000 + hrtime[1] / 1000;
var token = crypto.randomBytes(64).toString('hex');
var b36 = parseInt(token, 16).toString(36);
var result = '<';
result += microseconds;
result += b36;
result += '@' + hostname;
result += '>';
return result;
};
