$ sudo cat /etc/salt/grains
## IPtables Module ##
iptables:
  open-ports: [25,80,443]
  hosts-string: 'mail.tanta.io smtp.tanta.io server.tanta.io tanta.io mail smtp server'

## Webhosting Module ##
roundcube:
  base-path: '/var/www/webmail'
  roundcube-user: ''
  roundcube-db: ''
  roundcube-pass: ''

## Postfix Module ##
postfix:
  main:
    myhostname: 'tanta.io'
    myorigin: 'tanta.io'
    mydestination: 'tanta.io, mail.tanta.io, localhost.localdomain, localhost'
    mynetworks: '127.0.0.1'
    home-mailbox: '.Maildir/'
    cert-file: '/etc/letsencrypt/live/tanta.io/cert.pem'
    key-file: '/etc/letsencrypt/live/tanta.io/privkey.pem'
  root-alias: 'will'
  sender-access:
    - 'will@tanta.io all'
    - '@tanta.io local'
  local:
    - 'tanta.io OK'
  all:
    - '^*@* OK'

dovecot:
  mail-location: 'Maildir:~/.Maildir'
  ssl-cert: '/etc/letsencrypt/live/tanta.io/cert.pem'
  ssl-key: '/etc/letsencrypt/live/tanta.io/privkey.pem'

opendkim:
  key-table:
    - '# Managed by Salt'
    - 'default._domainkey.tanta.io tanta.io:default:/etc/opendkim/keys/default.private'
  signing-table:
    - '# Managed by Salt'
    - '*@tanta.io default._domainkey.tanta.io'
  trusted-hosts:
    - '# Managed by Salt'
    - '127.0.0.1'
    - 'mail.tanta.io'
    - 'tanta.io'