System.Net.Mail.SmtpException : Mailbox Unavailable

Sep 14, 2010

I've been getting the following exception when trying to send an e-mail using System.Net.Mail:

Unhandled exception in Service Thread:

System.Net.Mail.SmtpException: Mailbox unavailable. The server response was: Requested action not taken: mailbox unavailable
at System.Net.Mail.DataStopCommand.CheckResponse(SmtpStatusCode statusCode, String serverResponse)
at System.Net.Mail.SmtpConnection.OnClose(Object sender, EventArgs args)
at System.Net.ClosableStream.Close()
at System.Net.Mail.MailWriter.Close()
at System.Net.Mail.SmtpClient.Send(MailMessage message)

Does anyone know what this could be caused by?

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