Sending Email from personal domian

try
        {
            MailMessage Msg = new MailMessage();
            // Sender e-mail address.
            Msg.From = new MailAddress(txtUsername.Text);
            // Recipient e-mail address.
            Msg.To.Add(txtTo.Text);
            Msg.Subject = txtSubject.Text;
            // File Upload path
            //String FileName = fileUpload1.PostedFile.FileName;
            string path = Server.MapPath("~/images/byohbaraat logo.png");
            string mailbody = txtBody.Text + "<br /><img src=cid:companylogo>";
            LinkedResource myimage = new LinkedResource(path);
            // Create HTML view
            AlternateView htmlMail = AlternateView.CreateAlternateViewFromString(mailbody, null, "text/html");
            // Set ContentId property. Value of ContentId property must be the same as
            // the src attribute of image tag in email body. 
            myimage.ContentId = "companylogo";
            htmlMail.LinkedResources.Add(myimage);
            Msg.AlternateViews.Add(htmlMail);
            // your remote SMTP server IP.
            SmtpClient smtp = new SmtpClient();
            smtp.Host = "mail.byohbaraat.com";
            smtp.Port = 587;
            smtp.Credentials = new System.Net.NetworkCredential(txtUsername.Text, txtpwd.Text);
            smtp.EnableSsl = false;
            smtp.Send(Msg);
            Msg = null;
            Response.Write("Mail Sent Succesfully");
        }
        catch (Exception ex)
        {
            Console.WriteLine("{0} Exception caught.", ex);
        }