public static void SendMessage(string sendTo, string subject, string body, string replyTo = "", string sendCc = "", bool sendAsHtml = true) { var staticbody = body; string formattedBody = ""; if (sendAsHtml) { body = body.Replace(" ", " "); body = body.Replace(Environment.NewLine, "<br>"); formattedBody = MailTemplate.Replace("{{subject}}", subject); formattedBody = formattedBody.Replace("{{body}}", body); } try { var msg = new MailMessage { From = new MailAddress(MailFrom), Body = ((sendAsHtml) ? formattedBody : staticbody), IsBodyHtml = sendAsHtml, Subject = subject }; bool isAddressed = false; if (sendTo.Length > 0) { isAddressed = true; msg.To.Add(sendTo); } if (sendCc.Length > 0) { isAddressed = true; msg.CC.Add(sendCc); } if (!isAddressed) { return; } if (replyTo.Length > 0) { msg.ReplyToList.Add(replyTo); } if (sendAsHtml) { if (Logo != null && Logo.Length > 0 && formattedBody.IndexOf("cid:") > 0) { var oRes = new LinkedResource(new MemoryStream(Logo), "image/png") { ContentId = "logo.png" }; formattedBody = formattedBody.Replace("cid:", "cid:logo.png"); var oView = AlternateView.CreateAlternateViewFromString(formattedBody, new System.Net.Mime.ContentType("text/html")); oView.LinkedResources.Add(oRes); msg.AlternateViews.Add(oView); } } SendMessage(msg); } catch (Exception ex) { throw new Exception("SendMessage failed: " + ex.Message, ex); } }