Receiving emails
My @mac.com address is, after 30 years, not receiving emails from some senders across all devices. I am receiving most emails normally but new senders emails frequently don’t reach me, even when replying to an email from me. Impossible, of course, to tell how much this is happening. I just notice it when something I am expecting doesn’t turn up. Been happening for around 2 years now. Can’t find a solution. Would change Apple ID but literally my whole life and business is attached to this one! Any ideas? (Also, not sure if related, I sometimes see emails on my iPad which disappear and cannot be found.) Thank you.