C#郵箱身分識別驗證

                //身分識別驗證                if (!sfrom.ToLower().Contains("hotmail") && !sfrom.ToLower().Contains("hexun"))                {                    client.Credentials = new NetworkCredential(sSMTPuser, sSMTPpass);                }                client.DeliveryMethod = SmtpDeliveryMethod.Network;                if (sfrom.ToLower().Contains("gmail"))                {                    client.EnableSsl = true;                    client.Port = 587;                }                if (sfrom.ToLower().Contains("hexun"))                {                    client.Credentials = new NetworkCredential(sSMTPuser, sSMTPpass);                    // client.Credentials = new NetworkCredential(sfrom, sSMTPpass);                }                if (sfrom.ToLower().Contains("yahoo"))                {                    client.Port = 587;                }                if (sfrom.ToLower().Contains("hotmail"))                {                    client.EnableSsl = true;                    client.Credentials = new NetworkCredential(sfrom, sSMTPpass);                    client.Port = 25;                }