I have a Samsung Galaxy Edge 7. I use gmail to access my email. Everything was fine, and then yesterday, my phone stopped being able to send and receive emails. I use gmail to access my mail but both gmail AND the phones default email app are not able to receive/send email. I am able to access my email fine on my iPad Pro.
I have visited and tried all the troubleshooting suggestions online. Most walk you through setting up email initially, but like I said, everything was fine until yesterday. I did change my password.