E-MAIL RELAY

E-MAIL RELAY?

A. A user in your domain wants to send e-mail to another user in your domain - This is NOT relaying.
B. An outside user (from the Internet) wants to send e-mail to another user in your domain - This is NOT relaying.
C. A user in your domain wants to send e-mail to an outside user (on the Internet) - This IS relaying.
D. An outside user (from the Internet) wants to send e-mail to an outside user (on the Internet) - This IS relaying.