I have just installed Outlook with Office for Mac 2011, and am having problems with emails getting stuck in the Outbox - I've tried all the solutions I can find on the Microsoft site - please can anyone help?

This is the error I'm getting:

Cannot send mail. The SMTP server does not recognize any of the authentication methods supported by Outlook. Try changing the SMTP authentication options in Account settings or contact your network administrator.  (Error code 17092)

I am trying to use my gmail account and have enabled POP.  I'm using 'pop.gmail.com' '995' as the incoming server and 'smtp.gmail.com' '465' as the outgoing - emails are coming in OK I think, I just can't send anything.  Have I got the right outgoing server settings?

Many thanks