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A lot of tools allow you to send free emails but we recommend using SendinBlue or Constant Contact due to their easy to use interface & you can send 9000 & 10,000 emails free every month respectively. Check out our article on top free smtp servers and how to use a free smtp server to send transactional emails on your wordpress website.
You can refer to our guide on autoresponders here which you can use to set up free autoresponders for your emails at FREE OF COST.