SmtpStatusCode Enumeration

 

Specifies the outcome of sending e-mail by using the SmtpClient class.

Namespace:   System.Net.Mail
Assembly:  System (in System.dll)

public enum SmtpStatusCode

Member nameDescription
BadCommandSequence

The commands were sent in the incorrect sequence.

CannotVerifyUserWillAttemptDelivery

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 http://www.ietf.org.

ClientNotPermitted

The client was not authenticated or is not allowed to send mail using the specified SMTP host.

CommandNotImplemented

The SMTP service does not implement the specified command.

CommandParameterNotImplemented

The SMTP service does not implement the specified command parameter.

CommandUnrecognized

The SMTP service does not recognize the specified command.

ExceededStorageAllocation

The message is too large to be stored in the destination mailbox.

GeneralFailure

The transaction could not occur. You receive this error when the specified SMTP host cannot be found.

HelpMessage

A Help message was returned by the service.

InsufficientStorage

The SMTP service does not have sufficient storage to complete the request.

LocalErrorInProcessing

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 e-mail (spam). For details, see RFC 2505, which is available at http://www.ietf.org.

MailboxBusy

The destination mailbox is in use.

MailboxNameNotAllowed

The syntax used to specify the destination mailbox is incorrect.

MailboxUnavailable

The destination mailbox was not found or could not be accessed.

MustIssueStartTlsFirst

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.

Ok

The email was successfully sent to the SMTP service.

ServiceClosingTransmissionChannel

The SMTP service is closing the transmission channel.

ServiceNotAvailable

The SMTP service is not available; the server is closing the transmission channel.

ServiceReady

The SMTP service is ready.

StartMailInput

The SMTP service is ready to receive the e-mail content.

SyntaxError

The syntax used to specify a command or parameter is incorrect.

SystemStatus

A system status or system Help reply.

TransactionFailed

The transaction failed.

UserNotLocalTryAlternatePath

The user mailbox is not located on the receiving server. You should resend using the supplied address information.

UserNotLocalWillForward

The user mailbox is not located on the receiving server; the server forwards the e-mail.

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 http://www.ietf.org.

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

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 e-mail 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 e-mail 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();
	}
}

.NET Framework
Available since 2.0
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