Countdown timers in emails are displayed as animated images. Apple Mail may cache the timer image, which can stop the countdown from refreshing normally when the same email is opened again. Hiding the timer in Apple Mail avoids showing a cached countdown image that may no longer match the current timer state. Other supported email clients keep displaying the countdown as normal.
How to Hide a Countdown Timer in Apple Mail
Turn on this setting when Apple Mail caching could cause the countdown image to show outdated timer information.


