Emails not being delivered from one specific store.

I have had contact with the store (chewy.com) multiple times over several weeks now. Their messages are not being delivered to my xfinity address (yahoo and gmail work fine, but I do not use those addresses for shopping, so that is not a valid solution to my problem).

Messages from Chewy had been coming to this address with no problems for several years. Now nothing is getting through. I have disabled all spam protection, but still nothing. They have checked everything on their end, and can’t find anything wrong there. What could be going on?