Newsletter not working or faulty


Im working on a newsletter. I was ready to publish and hit the button. I got some kind of weird 505 screen. So I went back to dashboard, and there it said the post was still in draft fom. I check the analytics and there was no record of the letter being sent.

So I waited 20 minutes and tried again, this time went I tried to publish it it said already sent to my subscribers. Again I went back to the dashboard only to find the same situation. Post in draft form, no record of analytcis.

I need to send this today, please advise.