What is Smart Sync?
Smart Sync automatically extends the sync time the longer the Mail app is inactive. Set your email
account to Smart Sync when you don't need to check new email messages frequently. Smart Sync
helps save battery power.
If you want to receive email messages as they arrive, select another
Peak time sync
and
Off-peak
sync
schedule in the email account's
Sync, Send & Receive
settings.
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Calendar and Email