Just another plug for a very helpful tool that I’ve been using for testing SMTP code locally. Smtp4dev simulates an SMTP server on your local machine, allowing you to send email via a local SMTP connection in your code when you do not have a SMTP server setup. You can even inspect the messages to ensure that they are exactly as intended, with the subject, body, etc. Very simple, but useful tool that I find myself using quite often. http://smtp4dev.codeplex.com/ (see below for a basic example of sending a message via smtp locally)

public static void SendEmail(string aFrom, string aTo, string aSubject, string aBody)
    //create the mail message
    MailMessage mail = new MailMessage();

    //set the addresses
    mail.From = new MailAddress(aFrom);

    //set the content
    mail.Subject = aSubject;
    mail.Body = aBody;

    //send the message
    SmtpClient smtp = new SmtpClient("localhost");
    smtp.UseDefaultCredentials = true;