subscribers not receiving emails

Hi. My website is https://www.thesweetlifeonline.com

Recently my subscribers have no longer been getting emails. I’m not sure what happened, but when I go to my subscriber page it looks different. Rather than having a checkmark like this

√ “somebody”@yahoo.com (2014-03-27)

with the process boxes, it looks like this:

? “somebody”@outlook.com (edit)

with the circled “R” and no options to process.

Anyone who was registered before a certain date is no longer receiving my emails. How can I fix this problem? Thanks!

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