Use envelope sender is blank criteria

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Spoofing messages often have envelope senders (specified by the envelope field "MAIL FROM") set to blank to evade sender verification. TrendAI™ Email Security allows you to scan messages for empty envelope senders to help you combat spoofing.

Note

Some normal messages may also have empty envelope senders, such as bounce messages or notification messages. Selecting this criteria will affect these messages.
This criteria is available for inbound protection only.

Procedure

On the Scanning Criteria tab, click Advanced.
Select Envelope sender is blank.

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