using System.IO; using System.Net.Mail; using System.Reflection; using System.Text; namespace Infrastructure.MailMessageExtensions { public static class MailMessageExtensions { public static string ToEml(this MailMessage message) { var assembly = typeof(SmtpClient).Assembly; var mailWriterType = assembly.GetType("System.Net.Mail.MailWriter"); using (var memoryStream = new MemoryStream()) { // Get reflection info for MailWriter contructor var mailWriterContructor = mailWriterType.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { typeof(Stream) }, null); // Construct MailWriter object with our FileStream var mailWriter = mailWriterContructor.Invoke(new object[] { memoryStream }); // Get reflection info for Send() method on MailMessage var sendMethod = typeof(MailMessage).GetMethod("Send", BindingFlags.Instance | BindingFlags.NonPublic); // Call method passing in MailWriter sendMethod.Invoke(message, BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { mailWriter, true, true }, null); // Finally get reflection info for Close() method on our MailWriter var closeMethod = mailWriter.GetType().GetMethod("Close", BindingFlags.Instance | BindingFlags.NonPublic); // Call close method closeMethod.Invoke(mailWriter, BindingFlags.Instance | BindingFlags.NonPublic, null, new object[] { }, null); return Encoding.ASCII.GetString(memoryStream.ToArray()); } } } }