How to send HTML-formatted email? [duplicate]

Setting isBodyHtml to true allows you to use HTML tags in the message body:

msg = new MailMessage("xxxx@gmail.com",
                "yyyy@gmail.com", "Message from PSSP System",
                "This email sent by the PSSP system<br />" +
                "<b>this is bold text!</b>");

msg.IsBodyHtml = true;