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Right Inbox
Boomerang for Gmail
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I'll update this if I find more. For now, this seems to be a partial solution. It's a Gmail add on (except I don't use Gmail) that adds reminders. The options when setting reminders include cancelling it if someone replies, and to remind everyone in the thread. If you combine those two, it seems like — if you use Gmail's web client and have $23/month you're dying to get rid of — a decent way to add the feature. Source: over 1 year ago
Outlook4Gmail - Outlook4Gmail provides easy synchronization of your Outlook and Google accounts
FollowUpThen - The simplest way to schedule an email reminder
Boomerang for Outlook - Boomerang for Outlook offers email productivity tools to track, schedule and send mails at the right time.
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
BlueMail - BlueMail is an email management app for Android, iOS, and Windows.
Right Inbox - Schedule Emails in Gmail To Be Sent Later