Email server not responding on Samsung phone or tablet.

Using Safe mode will help you figure out if the email app is causing issues with your phone. Press and hold the Power key or Side key. On phones without a dedicated Power key, you can swipe down from the top of the screen to open Quick settings, and then tap the Power icon.

Then, touch and hold the Power off icon. Tap Safe mode when it appears. Your phone will restart and “Safe mode” will be displayed in the bottom left corner of the screen. Check if your email app is still causing issues on your phone. You can also remove it if needed. Restart your phone to exit Safe mode.