C# how to send email?

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Probably your authentication (credentials) or servername/port is not correct.

Try this:

        MailMessage mailMsg = new MailMessage();
        mailMsg.To.Add("[email protected]");
                    // From
        MailAddress mailAddress = new MailAddress("[email protected]");
        mailMsg.From = mailAddress;

        // Subject and Body
        mailMsg.Subject = "subject";
        mailMsg.Body = "body";

        // Init SmtpClient and send on port 587 in my case. (Usual=port25)
        SmtpClient smtpClient = new SmtpClient("mailserver", 587);
        System.Net.NetworkCredential credentials = 
           new System.Net.NetworkCredential("username", "password");
        smtpClient.Credentials = credentials;

        smtpClient.Send(mailMsg);

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