What mailing service can be used to import your database?

Question

Email Marketing

Recommend an e-mail mailing service that you can use to send letters to your database. You need a service where you can enter your addresses. The base is assembled by freelancers, then it is necessary to send out a commercial offer to it.

Answer 1

Any mailing service allows this;

Answer 2

mailgun, Sendgrid, Mandrill... and thousands of them.
alternativeto.net/software/mailgun is about all of them somewhere.