Office 365 email authentication

Hi,

we need to configure fim to send notification emails to user through Office 365 email service.

We implemented the notification workflow but it send no email. The event viewer shows this error:

System: 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 Microsoft.ResourceManagement.Mail.IlmSmtpClient.Microsoft.ResourceManagement.Mail.ISmtpInterop.Send(MailMessage )

   at Microsoft.ResourceManagement.Mail.SmtpServer.SendGenericMessage(GenericMessage message)

   at Microsoft.ResourceManagement.Mail.NotificationMessage.Send()

   at Microsoft.ResourceManagement.Workflow.Hosting.SendMailWorkItemProcessor.SendMailMessage(MessageContent messageContent)

   at Microsoft.ResourceManagement.Workflow.Hosting.SendMailWorkItemProcessor.ProcessWorkItem(WorkItem workItem)

Can you help me?

Thanks in advance.

Francesca