Outlook won't send on my MacBook Air

I was trying to send an e-mail with too large an attachment. I was able to get the Outbox to show, deleted the e-mail (and sent on g-mail in pieces). Now, Outlook receives but does not send. I'm not working Offline. How do I get it back to normal?

This thread is now locked and can not be replied to.

Surface Pro (2017) vs Surface Pro 4

20 groundbreaking 3D animation techniques

How to mine Bitcoin on Mac