Not showing email notifications in sleep mode

[MoxBV]

When  phone is in sleep mode, I don't get notifications for received emails, like for SMS.

Why, how to fix this?

[_alexdon_]

Are you using stamina?

[MoxBV]

No.

[MoxBV · Accepted solution]

I solved it.

Solution is to turn off WiFi Optimization, which turned off WiFi in sleep mode.