SmtpStatusCode Enum

Reference

Definition

Namespace:: System.Net.Mail

Assembly:: System.Net.Mail.dll

Assembly:: System.dll

Assembly:: netstandard.dll

Important

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Specifies the outcome of sending email by using the SmtpClient class.

public enum class SmtpStatusCode

public enum SmtpStatusCode

type SmtpStatusCode =

Public Enum SmtpStatusCode

Inheritance: Object

ValueType

Enum
SmtpStatusCode

Fields

Name	Value	Description
GeneralFailure	-1	The transaction could not occur. You receive this error when the specified SMTP host cannot be found.
SystemStatus	211	A system status or system Help reply.
HelpMessage	214	A Help message was returned by the service.
ServiceReady	220	The SMTP service is ready.
ServiceClosingTransmissionChannel	221	The SMTP service is closing the transmission channel.
Ok	250	The email was successfully sent to the SMTP service.
UserNotLocalWillForward	251	The user mailbox is not located on the receiving server; the server forwards the email.
CannotVerifyUserWillAttemptDelivery	252	The specified user is not local, but the receiving SMTP service accepted the message and attempted to deliver it. This status code is defined in RFC 1123, which is available at https://www.ietf.org.
StartMailInput	354	The SMTP service is ready to receive the email content.
ServiceNotAvailable	421	The SMTP service is not available; the server is closing the transmission channel.
MailboxBusy	450	The destination mailbox is in use.
LocalErrorInProcessing	451	The SMTP service cannot complete the request. This error can occur if the client's IP address cannot be resolved (that is, a reverse lookup failed). You can also receive this error if the client domain has been identified as an open relay or source for unsolicited email (spam). For details, see RFC 2505, which is available at https://www.ietf.org.
InsufficientStorage	452	The SMTP service does not have sufficient storage to complete the request.
ClientNotPermitted	454	The client was not authenticated or is not allowed to send mail using the specified SMTP host.
CommandUnrecognized	500	The SMTP service does not recognize the specified command.
SyntaxError	501	The syntax used to specify a command or parameter is incorrect.
CommandNotImplemented	502	The SMTP service does not implement the specified command.
BadCommandSequence	503	The commands were sent in the incorrect sequence.
CommandParameterNotImplemented	504	The SMTP service does not implement the specified command parameter.
MustIssueStartTlsFirst	530	The SMTP server is configured to accept only TLS connections, and the SMTP client is attempting to connect by using a non-TLS connection. The solution is for the user to set EnableSsl=true on the SMTP Client.
MailboxUnavailable	550	The destination mailbox was not found or could not be accessed.
UserNotLocalTryAlternatePath	551	The user mailbox is not located on the receiving server. You should resend using the supplied address information.
ExceededStorageAllocation	552	The message is too large to be stored in the destination mailbox.
MailboxNameNotAllowed	553	The syntax used to specify the destination mailbox is incorrect.
TransactionFailed	554	The transaction failed.

Examples

The following code example displays an error message to the console when an SmtpException is thrown.

static void CreateMessageWithAttachment3( String^ server, String^ to )
{
   
   // Specify the file to be attached and sent.
   // This example assumes that a file named data.xls exists in the
   // current working directory.
   String^ file = L"data.xls";
   
   // Create a message and set up the recipients.
   MailMessage^ message = gcnew MailMessage( L"ReportMailer@contoso.com",to,L"Quarterly data report",L"See the attached spreadsheet." );
   
   // Create  the file attachment for this email message.
   Attachment^ data = gcnew Attachment("Qtr3.xls");
   
   
   // Add time stamp information for the file.
   ContentDisposition^ disposition = data->ContentDisposition;
   disposition->CreationDate = System::IO::File::GetCreationTime( file );
   disposition->ModificationDate = System::IO::File::GetLastWriteTime( file );
   disposition->ReadDate = System::IO::File::GetLastAccessTime( file );
   
   // Add the file attachment to this email message.
   message->Attachments->Add( data );
   
   //Send the message.
   SmtpClient^ client = gcnew SmtpClient( server );
   
   // Add credentials if the SMTP server requires them.
   client->Credentials = dynamic_cast<ICredentialsByHost^>(CredentialCache::DefaultNetworkCredentials);
   
   // Notify user if an error occurs.
   try
   {
      client->Send( message );
   }
   catch ( SmtpException^ e ) 
   {
      Console::WriteLine( L"Error: {0}", e->StatusCode );
   }
   finally
   {
      data->~Attachment();
      client->~SmtpClient();
   }

}

public static void CreateMessageWithAttachment3(string server, string to)
{
    // Specify the file to be attached and sent.
    // This example assumes that a file named Data.xls exists in the
    // current working directory.
    string file = "data.xls";
    // Create a message and set up the recipients.
    MailMessage message = new MailMessage(
       "ReportMailer@contoso.com",
       to,
       "Quarterly data report",
       "See the attached spreadsheet.");

    // Create  the file attachment for this email message.
    Attachment data = new Attachment("Qtr3.xls");
    // Add time stamp information for the file.
    ContentDisposition disposition = data.ContentDisposition;
    disposition.CreationDate = System.IO.File.GetCreationTime(file);
    disposition.ModificationDate = System.IO.File.GetLastWriteTime(file);
    disposition.ReadDate = System.IO.File.GetLastAccessTime(file);
    // Add the file attachment to this email message.
    message.Attachments.Add(data);
    //Send the message.
    SmtpClient client = new SmtpClient(server);
    // Add credentials if the SMTP server requires them.
    client.Credentials = (ICredentialsByHost)CredentialCache.DefaultNetworkCredentials;
    // Notify user if an error occurs.
    try
    {
        client.Send(message);
    }
    catch (SmtpException e)
    {
        Console.WriteLine("Error: {0}", e.StatusCode);
    }
    finally
    {
        data.Dispose();
    }
}

Remarks

The values in the SmtpStatusCode enumeration specify reply status values sent by a Simple Mail Transfer Protocol (SMTP) server. The SmtpException and SmtpFailedRecipientsException classes contain StatusCode properties that return SmtpStatusCode values.

SMTP is defined in RFC 2821 available at https://www.ietf.org.

Applies to

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