That is a form of email marketing process in which you can have your mailing application such as Mailwizz on perhaps a VPS server and you can subscribe to an Smtp service like mailgun, Amazon ses. Next up: Windows Sandbox and Sandboxie give a risk-free implies to test out https://wordpress-install44443.jts-blog.com/26256595/linux-postfix-mail-server-setup-can-be-fun-for-anyone