What local software should be used to work with email newsletters?

Question

Email Marketing

For a long time we used one of the mailing list services, which carried out mailing through Mailgun and worked hard on our hatred of him. So I asked myself if there is a free (or not expensive) software for organizing mailing lists, i.e. lists, email editor, unsubscribe links, etc., which could be sent via an arbitrary SMTP server (let it be Mailgun)?