Potential leak of data: Default Credentials

Detected 1 occurrence(s) of ‘default\s*credentials’: ttachments.Add(new Attachment(mAtt, "rotina.xls")); mail.Body = "Foi detectado o seguinte problema"; SmtpClient smtp = new SmtpClient(); mail.From = new MailAddress("email_from", "name displayed"); smtp.Host = "smtp.gmail.com"; smtp.UseDefaultCredentials = true; System.Net.NetworkCredential NetworkCred = new System.Net.NetworkCredential(); NetworkCred.UserName = "email_from"; NetworkCred.Password = "password"; smtp.Credentials = NetworkCred; smtp.EnableSsl = true; smtp.Port = 587; Detected 1 occurrence(s) [...]