Is it possible to configure nginx as an smtp proxy with authorization by given login-password pairs?

Question

Nginx

Hello.
Is it possible to configure nginx so that it is an entry point for an SMTP client, but at the same time it sends mail through one of the smtp servers specified in advance (with authorization, chosen randomly)?
It is necessary to do a mailing list (officially, with a written application from clients), but external mail servers ban after a certain number of sent letters.

Answer 1

Either trusted services such as mailchimp or a properly configured mail server with dkim are suitable for solving your problem.