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Make sure the option "Block All Senders Except Contacts" under "Mail Settings --> Block Senders" is unchecked. If checked, you will not receive messages from anyone not in your contacts. Learn about delivery delays. Messages are often delivered right way though very rarely there may be a delay in transit.
Using PWM (pulse-width modulation, a technology where the intensity of the LEDs are kept constant, but the brightness adjustment is achieved by varying a time interval of flashing these constant light intensity light sources [26]), the backlight is dimmed to the brightest color that appears on the screen while simultaneously boosting the LCD ...