This is the error message i am getting now when trying to send emails. It did work fine a couple of days ago...

What I have tried :

1- Remove SSL to connect (I then receive an error message www.spamhaus.org/query...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.)

2 - Account / advance / security : no certificate selected

Everything is fine if i connect to webmail or my iphone. I can receive emails on the computer but cant send??