Email Not Being Sent, Stuck in Outbox?

Email Not Being Sent, Stuck in Outbox?

Over the last couple months I've noticed some emails getting stuck in my outbox and never get sent. I would click on "send now" and they seem to be going out until today. I have two emails in there and cannot get them to be sent.

I've never send many messages so I could not have been blocked. What's going on?