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Home Interviews How can you send HTML emails in C#? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 30 May 2025
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To send HTML emails in C#, you just need to set the MailMessage.IsBodyHtml property to true. This tells the SMTP system to treat the body as HTML instead of plain text.

Example: Sending an HTML Email in C#

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

class Program
{
    static void Main()
    {
        var fromAddress = new MailAddress("your-email@example.com", "Your Name");
        var toAddress = new MailAddress("recipient@example.com", "Recipient Name");
        const string subject = "Welcome to Our Service!";
        string htmlBody = @"
            <html>
            <body>
                <h2 style='color:blue;'>Hello!</h2>
                <p>Thank you for signing up. Click below to get started:</p>
                <a href='https://example.com/start' style='padding:10px 20px; background-color:green; color:white; text-decoration:none;'>Get Started</a>
            </body>
            </html>";

        var smtp = new SmtpClient
        {
            Host = "smtp.example.com",
            Port = 587,
            EnableSsl = true,
            DeliveryMethod = SmtpDeliveryMethod.Network,
            UseDefaultCredentials = false,
            Credentials = new NetworkCredential("your-email@example.com", "your-email-password")
        };

        using (var message = new MailMessage(fromAddress, toAddress)
        {
            Subject = subject,
            Body = htmlBody,
            IsBodyHtml = true
        })
        {
            smtp.Send(message);
        }
    }
}

Key Notes

  1. IsBodyHtml = true: This is essential to render HTML correctly.
  2. You can use full HTML, including images (linked via URL), inline styles, and layout tables.
  3. Be careful with inline CSS: Many email clients strip or ignore external stylesheets.

Want to Add Attachments or Inline Images?

  1. Use message.Attachments.Add(...) for files.
  2. Use LinkedResource inside an AlternateView to embed images inline.
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