computer-playbook/group_vars/all/03_system_email.yml

# Email Configuration
default_system_email:
  local:     no-reply
  domain:    "{{primary_domain}}"
  username:  "{{system_email.local}}@{{system_email.domain}}"
  host:      "mail.{{primary_domain}}"
  smtp_port: 465
  tls:       true
  start_tls: false
  from:      "{{system_email.username}}"
  smtp:      true