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I have a form that sends me a mail using this code:
WebMail.SmtpServer = "";
WebMail.SmtpPort = 587;
WebMail.EnableSsl = true;
WebMail.UserName = "mymailuser";
WebMail.Password = "mypassword";
WebMail.From = "";

WebMail.Send("", "RSVP Notification",
    Model.Name + " is " + ((Model.WillAttend ?? false) ? "" : "not")
        + "attending");

The form reports a successful send but I don't receive any mail (naturally I am using a valid username and password).

Bizzarely all I get in my inbox is a delivery note failure attempting to contact to my long defunct 02 mail account. I haven't referenced it anywhere in my code!!

What about this,
public void SendEmail(string from, string to, string subject, string body)
    string host = "";
    int port = 587;

    MailMessage msg = new MailMessage(from, to, subject, body);
    SmtpClient smtp = new SmtpClient(host, port);

    string username = "";
    string password = "password";

    smtp.Credentials = new NetworkCredential(username, password);
    smtp.EnableSsl = true;
    smtp.UseDefaultCredentials = false;

    catch (Exception ex)
        // do something with it...

Turns out I had an auto format on the Gmail account, and it is only obvious when I send mails from me to me. A quick test in outlook exhibited the same behaviour. Once removed all behaved as expected.

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