Subject: SMTP error when calling using anonymous
Date: 2014-05-21 21:55:03
From: Mike Tod
Source: smtp-error-calling-using-anonymous
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	I'm trying to send a message to an internal SMTP server using anonymous.

	My understanding is that I should only need to remove the client.Authenticate(SmtpUserID, SmtpPassword); call to send it via anonymous.

	I keep getting the following error : Client was not authenticated (530).

	Code example:

	[code lang='c#']

	// Create a new instance of the SmtpClient class.

	using (SmtpClient client = new SmtpClient())

	{

	try

	{   // Connect to the server.

	client.Connect(SmtpServerAddress, SmtpPort);

	// test for anonymous login

	if (!String.IsNullOrEmpty(SmtpUserID))

	{

	client.Authenticate(SmtpUserID, SmtpPassword);

	}

	 

	 

	// Create a new mail message.

	MailMessage msg = new MailMessage();

	msg.Subject = @subjectStr;

	msg.Priority = Priority;

	msg.BodyText = @bodyStr;

	msg.From.Add(SmtpFromUserID);

	msg.To.Add(toAddress);

	if (fileAttachment != null)

	{

	msg.Attachments.Add(fileAttachment);

	}

	 

	client.Send(msg);

	client.Disconnect();

	ReportLog(trfid, msgStr, EventLogEntryType.Information, 1000, Actions.Internal);

	}

	catch (SmtpException ex)

	{

	....

	}

	}

	[/code]

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