Outlook 2013 will not send messages.

I'm running W8.1 with Office 2013 Pro Plus. All updates are applied. Outlook 2013 will not send any emails that are more than a sentence long. It WILL send test email from account setup. And it will send an email with "test" as the subject and nothing in the body of the email. It receives email of any size just fine. I have uninstalled Office 2013 and reinstalled (then updated all 49 updates) but still won't send emails. What can I do?