Brother MFC 5840CN - Manual (Page 53)

7 - 6 BROTHER INTERNET FAX PRINTING SOFTWARE
NC9100h_FM6.0
is known as setting the “Trusted Domain”. For instance, if a network
machine has an E-mail address of [email protected] and users of
this machine also have E-mail addresses with the same domain
name then the machine must be told to allow these users to send
network faxes through the machine. This is known as the “Relay
Function” and “Trusted Domains”. So we set the trusted domain as
brother.com.
“Trusted Domains” Provide security for your machine. In that
only users from a particular domain can send faxes through
your network connected machine.