Not receiving Walmart emails

For a few weeks now, I have not been getting my walmart notification emails. This worries me that maybe I'm not getting others either. Certain emails come through, but needed emails from Walmart are no longer coming through. I've already checked the app settings for Walmart. They've had to send me screen shots of emails they have sent me because they are not getting through to me. And yes, I've checked my spam folder and nothings there.