Customize an "allow list" to receive email from a domain or user
Use the Microsoft Defender portal to create allow entries for domains and email addresses in the Tenant Allow/Block List
In the Microsoft Defender portal at https://security.microsoft.com, go to Email & collaboration > Policies & rules > Threat policies > Rules section > Tenant Allow/Block Lists. Or, to go directly to the Tenant Allow/Block Lists page, use https://security.microsoft.com/tenantAllowBlockList.
On the Tenant Allow/Block Lists page, verify that the Domains & addresses tab is selected.
On the Domains & addresses tab, select
Add, and then select Allow.In the Allow domains & addresses flyout that opens, configure the following settings:
Domains & addresses: Enter one email address or domain per line, up to a maximum of 20.
Remove allow entry after: Select from the following values:
- 45 days after last used date (default)
- 1 day
- 7 days
- Specific date: The maximum value is 30 days from today.
Optional note: Enter descriptive text for why you're allowing the email addresses or domains.
When you're finished in the Block domains & addresses flyout, select Add.
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