Syntax error command unrecognized the server response was

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• Question

• I cannot send mail from a certain smtp server. If i use the SmtpClient.Send() method i’m receiving timeout exception or something like that
  after certain amount of time, and if i use SmtpClient.SendAsync i don’t receive absolutelly nothing, the window just freezes and stays like that forever, no error, nothing. There is nothing wrong with my code, it works with other servers .
  Also there’s nothing wrong with the server and port settings too, i tried the same settings in Outlook 2010 and Thunderbird and it works fine . Can anyone help me with that?

Syntax error, command unrecognized. The server response was: 
status code :0 

   at System.Net.Mail.SmtpConnection.ConnectAndHandshakeAsyncResult.End(IAsyncResult result)
   at System.Net.Mail.SmtpClient.ConnectCallback(IAsyncResult result)

 System.Net.Mail.SmtpException: Syntax error, command unrecognized. The server response was: 
   at System.Net.Mail.SmtpConnection.ConnectAndHandshakeAsyncResult.End(IAsyncResult result)
   at System.Net.Mail.SmtpClient.ConnectCallback(IAsyncResult result)

3

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• Hello,

  I’m trying to do a very simple thing. I need to send an email from within my Exchange 2007 Transport Agent.

  I created a very simple app to test the mail sending. I use code similar to what you see below:

  Code Snippet

     Private Sub SendMessage()
          Dim MailMessage As New Mail.MailMessage(«<myaddress>@<server>», «recipients», «subject», «body»)
          Dim SmtpClient As New Mail.SmtpClient(«<server>»)
          SmtpClient.DeliveryMethod = Net.Mail.SmtpDeliveryMethod.Network
          SmtpClient.Credentials = New NetworkCredential(«<myaddress>», «<mypassword>»)
          Try
              SmtpClient.Send(MailMessage)
          Catch ex As Exception
              MsgBox(ex.Message)
          End Try
      End Sub

  For SMTP I use my Exchange 2007 server installed on the very same computer.

  If I type the same settings (server address, port, username, password, recipients, etc) into my mail client (Thunderbird) I can receive and send mails fine. However, if I type them in the code above, it will not work, always giving me this:

  «Syntax error, command unrecognized. The server response was: 5.7.3 Authentication unsuccessful»

  If I type incorrect username or password, the message changes to:

  «The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated»

  So I’m pretty sure the credentials are fine, and the problem is elsewhere.

  I searched the net and found many other people have the same problem, but nobody has a solution.

  With Exchange 2003 I used CDO and .NET 1.1, so I can’t comment if it is working with older versions of Exchange.

  Any ideas?

  Thanks in advance.

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1. Syntax error command unrecognized the server response was
2. Question
3. Syntax error command unrecognized the server response was
4. Question
5. Syntax error command unrecognized the server response was
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13. Question

[Error] Syntax error, command unrecognized. The server response was: 
System.Net.Mail.SmtpException: Syntax error, command unrecognized. The server response was: 
   at System.Net.Mail.SmtpConnection.ConnectAndHandshakeAsyncResult.End(IAsyncResult result)
   at System.Net.Mail.SmtpTransport.EndGetConnection(IAsyncResult result)
   at System.Net.Mail.SmtpClient.ConnectCallback(IAsyncResult result)

     context.Services.Replace(
                ServiceDescriptor.Transient<ISmtpEmailSender, MySmtpEmailSender>());

    public class MySmtpEmailSender:SmtpEmailSender
    {

        public MySmtpEmailSender(ISmtpEmailSenderConfiguration smtpConfiguration, IBackgroundJobManager backgroundJobManager) : base(smtpConfiguration, backgroundJobManager)
        {
        }

        protected override async Task SendEmailAsync(MailMessage mail)
        {
            AlternateView textView;
            AlternateView htmlView;
            mail = Fix(mail, out textView, out htmlView);
            try
            {
                using (var smtpClient = await BuildClientAsync())
                {
                    await smtpClient.SendMailAsync(mail);
                }
            }
            catch (Exception e)
            {
                throw;
            }
            finally
            {
                textView?.Dispose();
                htmlView?.Dispose();
                mail.Dispose();
            }

        }

        protected override void SendEmail(MailMessage mail)
        {
            AsyncHelper.RunSync(() => SendEmailAsync(mail));
        }


        protected MailMessage Fix(MailMessage message, out AlternateView textView, out AlternateView htmlView)
        {
            htmlView = null;
            textView = null;
            //force set encoding to utf8
            message.BodyEncoding=Encoding.UTF8;
            if (message.IsBodyHtml)
            {
                var mimeType = new ContentType("text/html");
                htmlView = AlternateView.CreateAlternateViewFromString(message.Body, mimeType);
                message.AlternateViews.Add(htmlView);
            }
            else
            {
                const string mediaType = "text/plain";
                textView = AlternateView.CreateAlternateViewFromString(message.Body, message.BodyEncoding, mediaType);
                textView.TransferEncoding = TransferEncoding.SevenBit;
                message.AlternateViews.Add(textView);
            }
            return message;


        }

1. I used this code:

   //create the mail message
   MailMessage mail = new MailMessage();

   //set the addresses
   mail.From = new MailAddress(«postmaster@fishabaka.com»);
   mail.To.Add(«mye-mail@live.com»);

   //set the content
   mail.Subject = «This is an email»;
   mail.Body = «this is a sample body with html in it. <b>test e-mail </b>»;
   mail.IsBodyHtml = true;

   //send the message
   SmtpClient smtp = new SmtpClient(«96.31.35.13», 21);
   NetworkCredential Credentials = new NetworkCredential(«postmaster@fishabaka.com», «password»,»fishabaka.com»);
   smtp.Credentials = Credentials;
   smtp.Send(mail);

   and I insert these tags within web.config file:

   <system.net>
   <mailSettings>
   <smtp deliveryMethod=»Network»>
   <network host =»96.31.35.13″ port =»21″ defaultCredentials=»true»/>
   </smtp>
   </mailSettings>
   </system.net>

   but I get this error:

   Syntax error, command unrecognized. The server response was: ‘HELO W01’: command not understood.

2. Change these lines on your code…

   SmtpClient smtp = new SmtpClient(«96.31.35.13», 21);
   to
   SmtpClient smtp = new SmtpClient(«96.31.35.13»);

   and..

   <network host =»96.31.35.13″ port =»21″ defaultCredentials=»true»/>
   to
   <network host =»96.31.35.13″ port =»25″ defaultCredentials=»true»/>

   Port 21 is a FTP port it is not a SMTP port.

3. I did as you said, but i get this error:

   No connection could be made because the target machine actively refused it 96.31.35.13:25

4. Sorry I just realized the IP address you are using is the web servers IP address. The email server will have a different IP address. Try using this as the smtp server ‘mail.fishabaka.com’. This will point you to our email server.

5. I got a new error:

   Mailbox unavailable. The server response was: <my-email@live.com> No such user here

   [SmtpFailedRecipientException: Mailbox unavailable. The server response was: <postmaster@fishabaka.comm> No such user here]
   System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) +1078355
   System.Net.Mail.SmtpClient.Send(MailMessage message) +1480
   _Default.Button1_Click(Object sender, EventArgs e) in e:webfishabakDefault.aspx.cs:34
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

   should I change any settings of my e-mail from control panel?

6. Mailbox unavailable. The server response was: <my-emailr@live.comm> No such user here

   This error means that the email address my-emailr@live.comm does not exist. I tried to ping ‘live.comm’ and the ping test failed so it proves that ‘live.comm’ doesn’t exist. I’m not sure if it is ‘live.com’ or something else but the error is pretty straight forward. This email ‘my-emailr@live.comm’ does not exist. Type in another email address and make sure it is a valide and active email address.

7. dude.. you are trying to send to live.comm with an extra m.

8. it’s just typing error while typing the replying …..

   but the syntax is well at my code ……

9. Was this error type wrong also?

   —SmtpFailedRecipientException: Mailbox unavailable. The server response was: <postmaster@fishabaka.comm> No such user here—

   Regardless, the email address you are typing on the code is wrong or the email address does not exist. I suggest double checking them.

10. O.K … I can now send e-mail to postmaster@fishabaka.com

    but I can’t to external e-mails

    I always get this error:

    Mailbox unavailable. The server response was: <anymail@hotmail.com> No such user here

11. Are you sure that this email address is active ‘anymail@hotmail.com’?

    If the email address are active, then the most likely cause is that you are not passing the SMTP authentication correctly. Remember, our SMTP server requires that you log in first before it will send out the email.

12. hi Ray …..

    What do you mean by SMTP authentication? if you mean username & password ,both of them are right.

    should I make any configuration of my mail server???

13. SMTP authentication is just another phrase which means you need to pass a login and password to the email server before the email server will send out the email. The login and password for the smtp server will not be the account or site ID login, but the full email address that exist in our smtp server. Typically you should have a postmaster account that will have an email address similar to this ‘postmaster@[somethingdomain].com’. I will not know the password that is something you will need to find out for yourself.
    Some programmers choose to declare these values and pass it off as variables. I suggest that you do not declare them but hard code them in.
    How do you know if your email account is working?
    The best way to know is to setup an email client such as Outlook to connect to the POP3 and SMTP server and set it up for SMTP authentication. If you email client can send it out then the SMTP server is working and it should work for your web site. But if it is not working for your website then you’ll know its because of some programming mistake somewhere in the coding.

14. I did it !!!!!!!!

    I just removed the parameter of string domain (fishabaka.com) .. and I can now send e-mails to any e-mail !!!

    Than kyou very much Ray

15. I believe you are speaking of this line..

    NetworkCredential Credentials = new NetworkCredential(«postmaster@fishabaka.com», «password»,»fishabaka.com»);

    Sorry I should have caught that.