C# - E-Mails aus Thunderbird Adressbuch lesen

        public List<string> getMailsFromThunderbird(string strFullPathToAbook)
        {
            try
            {
                List<string> listMails = new List<string>();
                string[] strLines = File.ReadAllLines(strFullPathToAbook);

                foreach (string strLine in strLines)
                {
                    if (strLine.Contains("@"))
                    {
                        int i = strLine.LastIndexOf("@");

                        for (int y = i; y >= 0; y--)
                        {
                            if (strLine.Substring(y, 1) == "=")
                            {
                                int intStartIndex = y;

                                for (int x = intStartIndex; x < strLine.Length; x++)
                                {
                                    if (strLine.Substring(x, 1) == ")")
                                    {
                                        int intLength = x;
                                        intStartIndex++;

                                        listMails.Add(strLine.Substring(intStartIndex, intLength - intStartIndex));

                                        x = strLine.Length;
                                        y = -1;
                                    }
                                }
                            }
                        }
                    }
                }

                return listMails;
            }
            catch (Exception ex)
            {
                // Mach etwas
                return null;
            }
        }