Failure sending mail.

Question

         string from, pass, messageBody;
            Random rand = new Random();
            randomCode = (rand.Next(999999)).ToString();
            MailMessage message = new MailMessage();
            to = (txtEmail.Text).ToString();
            from = "*********@gmail.com";
            pass = "***********";
            messageBody = "your reset code is" + randomCode;
            message.To.Add(to);
            message.From = new MailAddress(from);
            message.Body = messageBody;
            message.Subject = "Password resetting code";
            SmtpClient smtp = new SmtpClient("smtp.gmail.com");
            smtp.EnableSsl = true;
            smtp.Port = 465;
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.Credentials = new NetworkCredential(from, pass);

Answer 1

Hi @Apex6554,

It seems that your question is not related to MS SQL Server. Please remove that tag from your question.

If your question is related to c#, please try it like below.

All static data is stored in the app.config file.

void Main()
{
   try
   {
      string smtpAddress = AppSettings.Get<string>("smtpAddress"); //ConfigurationManager.AppSettings["smtpAddress"];
      int portNumber = AppSettings.Get<int>("portNumber"); //ConfigurationManager.AppSettings["portNumber"];
      bool enableSSL = AppSettings.Get<bool>("enableSSL"); ;
      bool UseDefaultCredentials = AppSettings.Get<bool>("UseDefaultCredentials"); ;

      string emailFrom = ConfigurationManager.AppSettings["emailFrom"];
      string password = ConfigurationManager.AppSettings["password"];
      string emailTo = ConfigurationManager.AppSettings["emailTo"];
      string subject = ConfigurationManager.AppSettings["subject"];
      string body = ConfigurationManager.AppSettings["body"];

      StringBuilder sb = new StringBuilder();
      sb.AppendLine(body);
      sb.AppendLine(string.Format("SMTP server: {0}, port: {1}", smtpAddress, portNumber));
      sb.AppendLine(string.Format("Sent from {0} machine on: {1}.", Environment.MachineName, DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss.fffzzz")));
      sb.AppendLine(string.Format(".Net version: {0}", Environment.Version));
      sb.AppendLine(string.Format("OS version: {0}", Environment.OSVersion.VersionString));

      body = sb.ToString();

      Console.WriteLine("SMTP server: {0}, port: {1}", smtpAddress, portNumber);

      using (MailMessage mail = new MailMessage())
      {
         mail.From = new MailAddress(emailFrom);
         mail.To.Add(emailTo);
         mail.Subject = subject;
         mail.Body = body;
         mail.IsBodyHtml = false;
         mail.Priority = MailPriority.High;

         // mail.Attachments.Add(new Attachment(@"C:\SomeFile.txt"));
         // mail.Attachments.Add(new Attachment(@"C:\SomeZip.zip"));

         using (SmtpClient smtp = new SmtpClient(smtpAddress, portNumber))
         {
            if (UseDefaultCredentials)
            {
               smtp.UseDefaultCredentials = true;
               //smtp.Credentials = CredentialCache.DefaultNetworkCredentials;
            }
            else
            {
               smtp.Credentials = new NetworkCredential(emailFrom, password);
            }

            smtp.EnableSsl = enableSSL;
            smtp.Send(mail);
         }
      }

      Console.WriteLine("An e-mail has been successfully sent to: {0}.", emailTo);
   }
   catch (Exception ex)
   {
      Console.WriteLine(ex.ToString());
   }
}

// Define other methods and classes here
public static class AppSettings
{
   public static T Get<T>(string key)
   {
      var appSetting = ConfigurationManager.AppSettings[key];
      if (string.IsNullOrWhiteSpace(appSetting)) throw new SettingsPropertyNotFoundException(key);

      var converter = TypeDescriptor.GetConverter(typeof(T));
      return (T)(converter.ConvertFromInvariantString(appSetting));
   }
}

<configuration>
   <appSettings>
      <add key="smtpAddress" value="smtp.mail.yahoo.com"/>
      <add key="portNumber" value="587"/>
      <add key="enableSSL" value="true"/>
      <add key="emailFrom" value="ykhabins@yahoo.com"/>
      <add key="password" value="Password"/>
      <add key="UseDefaultCredentials" value="false"/>

      <add key="emailTo" value="ykhabins@gmail.com"/>
      <add key="subject" value="Hello"/>
      <add key="body" value="This is e-mail testing via SMTP protocol."/>
   </appSettings>
</configuration>

Answer 2

Hi, Apex6554
I got a Failure sending mail message when using port 465.
Tested port 587 and used 2 step auth to gererate windows password. It worked for me.

smtp.Port = 587;

pass="generated windows app code" Best regards, Minxin Yu

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