here's a short code snippet showing how to parse the from/to/subject from an eml file as well as any urls located in the message. the regex for urls isn't perfect. there are a million ways to do url regex, so pick your poison from the web. this is just for example. reposted from here.

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using System;
using System.IO;
using System.Text.RegularExpressions;

namespace parse.eml
{
    class Email
    {
        string _path,_to,_from,_subject,_urls;

        public Email(string path)
        {
            _path = path;
            string fc = new StreamReader(path).ReadToEnd();
            _from = Regex.Matches(fc, "From: (.+)")[0].ToString();
            _to = Regex.Matches(fc, "To: (.+)")[0].ToString();
            _subject = Regex.Matches(fc, "Subject: (.+)")[0].ToString();
            _urls = string.Empty;
            foreach (Match m in Regex.Matches(fc,@"https?://([a-zA-Z\.]+)/"))
            {
                _urls += m.ToString() + ' ';
            }
        }

        public void show()
        {
            Console.WriteLine(
                "{0}\n\t{1}\n\t{2}\n\t{3}\n\t{4}",
                _path, _to, _from, _subject, _urls);
        }

    }

    class Program
    {
        static void Main(string[] args)
        {
            foreach (string f in Directory.GetFiles(".", "*.eml"))
            {
                Email e = new Email(f);
                e.show();
            }
        }
    }
}