Hello,
There is one sender (external sender ) who keeps sending mails to our users mailboxes and has been detected as spam mail by our firewall, i tried to create a new rule to block that sender, but i think im missing something, i created rue with the following configuration:
Apply this rule if: The sender is located = outside the organization
and
The sender is: ( Here i do not know what option to select to type the mail that i want to block)
Do the following: Block messages
Is creating a rule is the best way to block external mail, or there is another way.
Regards,