Not sending emails

Emails are not sending from my Mailpoet 3 plugin. I have tried to send 2 different emails. One I sent immediately and the status indicated 0% for over 8 hours and Sent on indicated Not sent yet. The second email was a duplicate, which I scheduled. An hour after the scheduled time, it was Not sent yet and the status indicated only the date and time it was to be sent.

I checked my server’s mailqueue and the mail send reports and no mail was sent. I have another domain on the same server using Mailpoet 2 and there have been no problems sending emails.