What are some good email marketing services?

Question

Email

I have over 2000 followers on my site.
Depending on the type of subscription, I send newsletters to certain users.
Mailing by means of OpenCart has already become very expensive, so the question is:
What are some good third-party e-mail mailing services that provide a convenient API, so that you can do mailing from the cms admin panel?

Answer 1

https://www.mandrill.com/