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Editorial Team
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Asked: 2026-05-27T10:52:43+00:00

I have a small email application that lets a user build a message from

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I have a small email application that lets a user build a message from checkboxes and then send the message as an email. I am trying to add an image to the email, i.e. a logo or signature. The application worked fine but as I was reseaching getting the images into the email, I found that I should be using System.Net.Mail instead of Interop. So I changed my email class to the code below. Now I’m not recieving the emails. I’m assumeing this is because the code is set-up for a server and I just want to run this on my local machine. This is just something I’m playing with to help me understand some concepts so real world use is not going to be a factor. I just want to be able to test my little program on my Outlook email account locally. My code is as follows…

using System;
using System.Net.Mail;
using System.Net.Mime;

namespace Email_Notifier  
{
    public class EmailSender:Notification
    {
        string emailRecipient = System.Configuration.ConfigurationManager.AppSettings    ["emailRecipient"];

        public void SendMail(string message)
        {
            try
            {
                string strMailContent = message;
                string fromAddress = "MyApp@gmail.com";
                string toAddress = emailRecipient;
                string contentId = "image1";
                string path = (@"C:Libraries/Pictures/Logo.gif");  

                MailMessage mailMessage = new MailMessage(fromAddress, toAddress);
                mailMessage.Subject = "Email Notification";

                LinkedResource logo = new LinkedResource( path , MediaTypeNames.Image.Gif);
                logo.ContentId = "Logo";
                // HTML formatting for logo
                AlternateView av1 = AlternateView.CreateAlternateViewFromString("<html><body><img src=cid:Logo/><br></body></html>" + strMailContent, null, MediaTypeNames.Text.Html);
                av1.LinkedResources.Add(logo);

                mailMessage.AlternateViews.Add(av1);
                mailMessage.IsBodyHtml = true;
                SmtpClient mailSender = new SmtpClient("localhost"); 
                mailSender.Send(mailMessage);
            }

            catch (Exception e)
            {
                Console.WriteLine("Problem with email execution. Exception caught: ", e);
            }
            return;
        }
    }
}
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1 Answer

  1. Editorial Team

    You specify mailSender = new SmtpClient("localhost");.

    Have you set up an SMTP server on your local machine? If not, you will need to do so to use SmtpClient. Otherwise, specify a hostname other than localhost, perhaps using your Gmail account as specified here, bearing in mind you will need to configure it for authentication and SSL.

    See also the documentation for SmtpClient.

    There are also one or two other issues I can see with your code – but let’s deal with these after getting simple mail sending working.

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