A content dictionary is a list of words or phrases that can be used to match against message content in Cisco ESA. For Forged Email Detection, a content dictionary can be used to specify the display names of internal senders that should not appear in the From header of external messages. The display name is usually the name of the sender as it appears in the email client, such as Alpha Beta. Therefore, the entry that will be added into the dictionary for this purpose is Alpha Beta.
[References: User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway, page 9-8., , , Reference: https://www.cisco.com/c/en/us/products/collateral/security/email-security-appliance/ whitepaper_C11-737596.html, ]
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