Relay hostnames that have MX records are looked up by postfix and the MX record's payload is used instead. This special behavior may be undesirable, so we make sure to point it out.
Prerequisites
Configuring your DNS server
Configuring this Ansible playbook
Installing
Registering users
Configuring service discovery via .well-known
Maintenance / checking if services work
Maintenance / upgrading services
Maintenance / upgrading PostgreSQL
Maintenance and Troubleshooting
Uninstalling