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If No Reply - Simple email automation that works for Gmail
SendLater - Email scheduler for Mac Mail.
Email Studio for Gmail - Send personalized emails, schedule emails directly in Gmail
The Top Inbox - The Top Inbox for Gmail helps to schedule emails to be sent later, set reminders in the inbox and follow up with email sequences.
Boomerang Premium - Schedule email to be sent later, now w/ Premium features
EmailPlayground - EmailPlayground provides solution to schedule and send emails with ease.