smtp sending mail even without password

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C#

ASP.NET

SMTP

i wrote this code to send mail it works perfectly but i detected something very dangerous, it sends mail to people even if i don't provide my PASSWORD, i ony put "" instead of password in creditentials and it works why ?

SmtpServer.Credentials = new System.Net.NetworkCredential(txtEmailFrom, "");
SmtpClient SmtpServer = new SmtpClient("[DELETED].pk");
                var mail = new MailMessage();
                mail.From = new MailAddress(txtEmailFrom);

                string[] to = txtEmailTo.Split(';');
                foreach (string mailTo in to)
                {
                    mail.To.Add(mailTo);
                }

                string[] cc = txtCC.Split(';');
                foreach (string copyTo in cc) 
                {
                    MailAddress cCopy = new MailAddress(txtCC);
                    mail.CC.Add(copyTo);
                } 
                mail.Subject = txtSubject;
                mail.IsBodyHtml = true;
               // mail.CC = txtCC;
                string htmlBody;
                htmlBody = txtBody;
                mail.Body = txtBody;
                SmtpServer.Port = 25;
                SmtpServer.UseDefaultCredentials = false;
                SmtpServer.Credentials = new System.Net.NetworkCredential(txtEmailFrom, "");
                SmtpServer.EnableSsl = false;
               
			
	
	     try {
                SmtpServer.Send(mail);
                ViewBag.Confirmation = "Daily Log Has Been Submitted";
                return View();
             }
         
         catch (Exception ex) 
             {
               ViewBag.Confirmation = ex.Message;
               return View();
  	         }
      }

[edit]Open email server address removed - OriginalGriff[/edit]