Newsletters subscribed to not being received

I used to receive all of them and over time they have stopped, not all at once. I receive lots of emails, just not certain newsletters. I get my emails on apple devices - MacbookPro, iPhone and iPad. Same emails show and same don't on each device.

So the emails are showing on some devices, but not others, is that correct? Is the Spam Filtering feature active? Have we attempted to add the email addresses to the Email Safe List? 

Set email filters or spam filters — Xfinity Email help

No that is not correct. I have the same emails on each device. The newletter emails are not showing up anywhere. They used to. The previous person asked me whether I was getting other emails and the answer is yes.

The missing emails to which I subscribe are no where, including spam. Xfinity has something blocking. 

The link provided details how to add email addresses to your safe list, which means they will be delivered to the inbox and not go into Spam. This may also help getthem fully delivered to you if they are not coming through.