Lots of other people are reporting Microsoft Mail App problems. Notifications not working, live tile not displaying, no sound notification and email arriving very late.
I have gone thru every Mail App setting in Windows 10 more than once. I have been involved in Mail App posts on Microsoft Community forums, adding up the other people who post or click "ME TOO' I come up with 30 people currently having these problems. I do not know how many of them have Norton.
Here is what I have done. I permanently disabled my Norton Firewall. Then I restarted my computer and checked CONTROL PANEL > WINDOWS FIREWALL it was ON.
Now my Microsoft Mail App WORKS PERFECTLY. Live tile, sounds, notifications and speedy email. It is easy for me to test this because I have 5 email accounts and can send myself emails. I hope Norton is working on a HOTFIX.