{% call macros.panel("info", "Step 4 - expose Mailu to the world") %}
A mail server must be exposed to the world to receive emails, send emails, and let users access their mailboxes. Mailu has some flexibility in the way you expose it to the world.
You server will be available under a main hostname but may expose multiple public
hostnames. Every e-mail domain that points to this server must have one of the
hostnames in its MX
record. Hostnames must be comma-separated. If you're having
trouble accessing your admin interface, make sure it is the first entry here (and possibly the
same as your DOMAIN
entry from earlier.