Email setup not working with Office 365

Hi,

I have been trying to set up a mail server within Confluence (both on our live system, v4.3.3 and our Dev system - v5.1.4) to use Microsoft Office 365 as it's SMTP server and every time I try a test mail I get a message starting with the following text:

An error has occurred with sending the test email:
com.atlassian.mail.MailException: javax.mail.MessagingException: [EOF]

I have searched for answers on this but not found any conclusive evidence which could show me whether this will work or not.

Could you please let me know if Office365 is actually supported, and if so, what do I need to do in order to get this working?

Thanks,

Jim