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Follow these steps:

Go to Inbound Protection > Content Filtering > Click Add to create a new policy.
Under Basic Information, enter the name of the policy.
Under Recipients and Senders > Recipients, choose Specify then enter the user's email address. Click Add.
Under Scanning Criteria > Advanced, check Envelope sender is blank.
On the Actions Tab > Intercept > Quarantine, click Submit.

Keywords: Null Sender, <> Sender, Blank Sender

Block null sender from Trend Micro Email Security (TMEMS) Console

Product / Version includes:

Trend Micro Email SecurityAll

Last updated: 2023/06/29

Solution ID: KA-0014725

Category: Configure

Summary

This article shows how to block null sender from TMEMS console.

Follow these steps:

Go to Inbound Protection > Content Filtering > Click Add to create a new policy.
Under Basic Information, enter the name of the policy.
Under Recipients and Senders > Recipients, choose Specify then enter the user's email address. Click Add.
Under Scanning Criteria > Advanced, check Envelope sender is blank.
On the Actions Tab > Intercept > Quarantine, click Submit.

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