Not receiving emails

I have not been receiving emails for over a week now.  I have logged into xfinity online and am not receiving emails in my xfinity inbox as well.  So I am not receiving emails on my phone, on my laptop through outlook, or through my laptop on the xfinity site.  I have tried everything that I found online to try to correct this issue and I have had no success.  What is causing this?  And how is this fixed?