How to fix it?

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I am really confuse these past few days because all of a sudden i don't get notification from my email. I used to have notification, but i don't suddenly. I didn't do anything or change anything on the setting, literally. Because of that i missed some important things that sent me from email, or always found it late, i can't always open it to check new messages tho. I checked the setting in my phone and my email, the sign of notification is on, everything that attached to it is on but still i don't get notification. This is kinda stress me out.