From the approved test segment, a transit mail server behaves as an open relay. How should this be classified?
Select an answer to reveal the explanation.
Short Explanation
An open relay is a postage machine that stamps anyone’s mail—sooner or later it gets abused. Even if you didn’t watch spam fly during the test, the misconfig is the problem. Harden who can relay; don’t wait for the complaint pile.
Full Explanation
Open mail relays accept and forward messages for unauthorized senders, enabling spam and phishing abuse that can damage reputation and exhaust resources. The finding is the weak service posture itself, not only observed abuse during a short test window. Controls include authentication requirements, network ACLs, and proper relay restrictions. Documenting the misconfiguration helps operations close a classic Internet-facing service gap.