SSMTP_ROOT
SSMTP_MAILHUB
SSMTP_MAILDOMAIN

SITES_SUBNET_ADDR
SITES_SUBNET_MASK
SITE_DNS1
SITE_DNS2

OVPN_SUBNET_ADDR
OVPN_SUBNET_MASK

OVPN_LDAP_URL
OVPN_LDAP_BIND_USERNAME
OVPN_LDAP_BIND_PASSWORD
OVPN_LDAP_BASE_DN
OVPN_LDAP_SEARCH_FILTER