Use this setting to determine whether all hosts should be subject to the
specified for the server. In the absence of the setting, any internal
hosts would be exempt
from the controls.
0 (or not present) - Exempts internal hosts from anti-spam controls
1 - Internal hosts included for anti-spam controls
In the server's Configuration Settings document, first click the
Router/SMTP tab, then the
Restrictions and Controls tab, and finally the SMTP Inbound Controls tab.
In the Inbound Relay
Enforcement section's "Perform Anti-Relay enforcement for these
connecting hosts" field,
select "All connecting hosts" or "External hosts."
SMTPAllHostsExternal = value