My variables for this role are configured in the host_vars
folder for my smtp relay host specifically. If you wish to
use this role yourself, you will need to define the
following variables:

---
upstream_smtp_relay_server: your.relay.example.com
upstream_smtp_relay_port: '587'
upstream_smtp_relay_username: upstream-relay-username
upstream_smtp_relay_password: upstream-relay-password

local_smtp_relay_hostname: your.local.relay.hostname
local_smtpd_banner: your-smtp-banner-can-be-anything

smtp_users:
  - username: user1
    password: password1
  - username: user2
    password: password2