Question

The sender email on posfix smtp server is the name of the droplet, how do I change this to an actual email address?

When I send a postfix email from the server via ssh, i get the email but it says the email is from {username}@{name of droplet} . How do i make it like john@example.com?

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This guide will help you configure your MX and DNS records such that you can use your own domain for your emails: https://www.digitalocean.com/community/tutorials/how-to-set-up-a-postfix-e-mail-server-with-dovecot