Designate email domains as untrusted or trusted
Designate specific email domains as untrusted or trusted so that you can monitor the metrics for incoming emails from these sources in your instance.
Before you begin
About this task
Note:
Designating an email domain as untrusted is for security tracking
purposes only. Administrators can also set up a system address filter to ignore
emails from untrusted domains. To learn about filtering emails to block their
delivery, see System address
filters.