Setup a send only server

• http://ubuntuhandbook.org/index.php/2014/04/change-hostname-ubuntu1404/
• https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-16-04
• https://www.ubuntuupdates.org/package/core/precise/main/base/postfix-pcre
• https://blog.hqcodeshop.fi/archives/122-Fixing-Googles-new-IPv6-mail-policy-with-Postfix.html
• https://serverfault.com/a/866440/444133

Setup hosts

• run hostname to get hostname
• add the following line to /etc/hosts, use the hostname you got from above line
• 127.0.0.1 localhost.localdomain hostname

Run Mail Server

• run it using pm2 start pm2-mail.json for easier access
• It will run on port 8001 by default.