Relay settings

With relay settings, you can allow XG Firewall to act as outbound mail relay for hosts in the network and as inbound relay for emails from upstream hosts. You can enforce user authentication to use the relay.

Host-based relay

Allow relay from hosts/networks
Hosts and networks that can use XG Firewall as mail relay.
CAUTION Do not select “Any”. It results in an open relay, allowing anyone on the internet to send emails through XG Firewall.
Note If the IP addressess that you’ve allowed for host-based relay fail scanning, XG Firewall will reject them.
Block relay from hosts/networks
Hosts and networks to be blocked.
Note For hosts and networks appearing in both allow and block lists, XG Firewall allows the relay.

Upstream host

Allow relay from hosts/networks
Upstream hosts and networks to allow inbound emails from, for example, ISP or external MX.
Block relay from hosts/networks
Upstream hosts and networks to block inbound emails from.
Note For hosts and networks appearing in both allow and block lists, XG Firewall allows the relay.

Authenticated relay settings

Enable authenticated relay
Select to require authentication of users and groups to use XG Firewall as mail relay.
Users or groups
Specify the users and groups who require authentication.