Short Description: Use this setting to determine whether all hosts should be subject to the anti-spam controls specified for the server.
When this is set on the server, all connecting servers are seen as members of external Internet domains. All the domains listed in the Global Domain document are seen as Internal hosts, they do not have relay restrictions applied, and are able to relay messages.
0 - Exempts internal hosts from anti-spam controls.
1 - Internal hosts included for anti-spam controls.
UI equivalent: 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."
In the absence of the setting, any internal hosts would be exempt from the controls.
SMTPAllHostsExternal=0 / 1
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