Opencart abandoned cart e-mail can send from admin. no need to get other e-mail services and spend a lot of $$$.
You can convert e-mail template to HTML template. And then use converted Html e-mail template into the OpenCart abandoned cart module If the module does not support custom e-mail template then, you must ask the module developer company or developer to change the e-mail template to new you created.
Use that e-mail template for abandoned OpenCart cart module which will ultimately deliver you more sale. Always try to update e-mail template according to trend in your market.
To get the most out of it you can use TMD OpenCart Abandoned Cart Module to recover lost orders from customers who have interacted with your products and added products to their cart but did not make a purchase.
So this module can help you recover your abandon cart without making many efforts, or in other words, it helps to recover sales for those who have left the cart without completing the checkout process
To reduce your own work. Always use those modules, which can send abandoned cart e-mail to customer after some time or one day. This time also adjustable from admin.