Go back to ST0-250 - Symantec Messaging Gateway 10.5 Technical Assessment

Question :-

How does enabling and configuring sender authentication options in Symantec Messaging Gateway 10.5 help to protect against spam?
by protecting against messages sent from trusted partners
by protecting against messages sent using a Sendmail MTA
by protecting against messages with a forged message ID
by protecting against messages with forged sender domains

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