C# how to send email?

Question

I am using C#.NET 4.0 and would like to send an email to an address with a subject and a body, the body will contain some information from a few text-boxes in my application

Answer 1

Is smtp.server.com really an SMTP server? You need to replace that with a real one. Your ISP probably provides you one, but it will likely only relay for emails originating from an address that your ISP owns.

Answer 2

I have worked with three well known ISP’s to host my client’s websites. All three ISP's instructed me to use “localhost” as the smtp server name.

Answer 3

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

Try this:

        MailMessage mailMsg = new MailMessage();
        mailMsg.To.Add("test@hotmail.com");
                    // From
        MailAddress mailAddress = new MailAddress("you@hotmail.com");
        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);

Answer 4

you cannot leave this string:

smtp.server.com

you should have there the name of your smtp server, usually something like mail.yourcompanyname.com or smtp.yourcompanyname.com

Answer 5

Add this:

SmtpServer.EnableSsl = true;