At this moment we are using Workflow 8.0, We have recently upgraded to exchange 2013 and the work flow is no longer sending emails. We have the SMTP relay enabled on the exchange server, the error we get when workflow is attempting to send an email is it is attempting to authenticate. Here is the error when it is attempting to send an email

Timestamp: 8/12/2014 7:29:50 PM
Message: System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated
   at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response)
   at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at Laserfiche.Workflow.Runtime.Services.Tasks.EmailTaskExecutor.Execute(EmailTaskOptions options, TaskExecutorContext status)
Category: Activity
Priority: 4
EventId: 100
Severity: Critical
Title:
Machine: (Removed)
Application Domain: Laserfiche.Workflow.Service.exe
Process Id: 3800
Process Name: C:\Program Files\Laserfiche\Laserfiche Workflow\Laserfiche.Workflow.Service.exe
Win32 Thread Id: 4224
Thread Name: Work Runtime
Extended Properties:

as far as we are aware there should be no authentication for this type of email

Thanks James

Update: I for got to Add that this has been doing it anonymously on exchange 2007