How is it possible to block emails that are spoofing the local domain on the Symantec Messaging Gateway (SMG)?
The envelope sender in the header of the message lists the local domain as well as the envelope recipient and the email is coming from the outside of the local domain.
Steps for creating a compliance rule to block spoofing domains.
Create Compliance Rule
Technical Information Stopping spoofed domains could also be accomplished with SPF records, Bad Senders list, or DKIM (version 9 only).
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