Question

I am using ASP.NET Web forms and sending an automated email through our SMTP Emailing system. In my web.config I added this:

 <mailSettings>
      <smtp from="[e-mail]">
          <network host="111.111.1.1" port="25" defaultCredentials="true" />
      </smtp>
  </mailSettings>

Now I am writing this code to send an email:

               MailMessage message = new MailMessage();
                message.From = new MailAddress("[e-mail]");
                message.To.Add(new MailAddress("[e-mail]"));
                message.CC.Add(new MailAddress("[e-mail]"));
                message.Subject = "Testing";
                message.Body = bodymessage;
                SmtpClient client = new SmtpClient();
                client.Send(message);

At the last line I am getting this error mesg:

{“Mailbox unavailable. The server response was: 5.7.1 Client does not
have permissions to send as this
sender”}

What is wrong here?

Answer 1

Perhaps there is authentication on the SMTP server? Try using

client.Credentials = new System.Net.NetworkCredential(username, password);