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SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
SendLater - Email scheduler for Mac Mail.
Recurrr - Send recurring emails
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.
FollowUpThen - The simplest way to schedule an email reminder
EmailPlayground - EmailPlayground provides solution to schedule and send emails with ease.