Sender/Domain Block

This guide will allow administrators to create a blacklist enforcement on a desired address or domain to prevent emails reaching end users.

Role Requirements

Procedure Scope: Administrators

Required Group Membership: Admin.Security

Handbook Reference

Package: Email Security

Domain: Sender Block Management

Modifies: Unsanctioned Senders and Domains

Sender/Domain Block

  1. Navigate to Domains & Addresses – 365 Defender, select the Block option to create the external block for the desired address or domain. A pop-up will be displayed where you will be able to supply the necessary addresses or domains, you will want to specify the Remove Block Entry After dropdown to be Never Expire to ensure that this block won’t need to be reestablished. Optional Note will be used as a supplemental area for other admins when viewing this section, you will add a brief explanation on why the block has been initiated on this address or domain. Select Add to finalize the block.

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