[Plugin: Easy Automatic Newsletter Lite] Email sends to some, not all

I have been trying all morning to get my newsletter to send. Apparently it is sending to some, not all of my contacts. Any ideas on what to do? I have my own personal email address in the list to be sure when an email goes. Nothing received, yet another subscriber got it several times (each time I tried to make it go).

https://www.ads-software.com/extend/plugins/easy-automatic-newsletter/