Shortwave imports your last 90 days of email history when you first sign up. To import your entire Gmail history and unlock unlimited search history, you'll need to upgrade your account.
Warning: Taking massive bulk actions (e.g. deleting 1,000 emails) can cause your import to stall and delay the arrival of new emails in Shortwave. We suggest limiting bulk actions to 500 threads at a time or doing a larger batch (no more than 5,000 threads) before you go to bed so things can sync overnight and will be caught up by the morning.
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