I need to send and receive emails for several domains on a digitalocean VPS. I can not find the correct configuration for the emails to come out with [email protected] for each domain and you can receive emails to the same account (even if the account does not exist). I followed digitalocean tutorials to configure postfix but I can not solve how to configure an FQDN for the Droplet and keep the virtual hosts for each site in addition.
For clarification, the sites that are currently in operation have already been pointed to the digitalocean servers and are developed in symfony3.