How to Enable Cross-Tenant Message Recall in Exchange Online

Have you ever sent an email to someone in another Microsoft 365 tenant and immediately wished you could take it back? Well, now you can. With cross-tenant message recall, organizations can allow trusted Microsoft 365 tenants to recall messages sent to their users. In this article, you will learn how to enable cross-tenant message recall in Exchange Online.

Connect to Exchange Online PowerShell

First, Install the Exchange Online PowerShell module.

Install-Module -Name ExchangeOnlineManagement -Force

Once the module is installed, Connect to Exchange Online PowerShell.

Connect-ExchangeOnline

Check cross-tenant recall configuration

Check the tenant’s current configuration to see whether cross-tenant message recall is enabled and which external tenants are allowed.

Get-CrossTenantRecallConfiguration

The output appears.

CrossTenantRecallEnabled AllowedSenderTenantIds
------------------------ ----------------------
False                    {}

Enable cross-tenant message recall

To enable the feature for your tenant, run the command below.

Set-CrossTenantRecallConfiguration -CrossTenantRecallEnabled $true

You have now enabled the feature for your tenant. Next, specify which external tenants can recall messages.

Add Microsoft 365 allowed sender tenant

To allow a specific Microsoft 365 tenant to recall messages sent to users in your organization, add its tenant ID to the -AllowedSenderTenantIds parameter.

Allow for a single tenant.

Set-CrossTenantRecallConfiguration -AllowedSenderTenantIds @{Add="11111111-2222-3333-4444-555555555555"}

Allow for multiple tenants.

Set-CrossTenantRecallConfiguration -AllowedSenderTenantIds @{Add="11111111-2222-3333-4444-555555555555","66666666-7777-8888-9999-000000000000"}

Remove Microsoft 365 allowed sender tenants

To remove all allowed Microsoft 365 tenants, run the following command:

Set-CrossTenantRecallConfiguration -AllowedSenderTenantIds @{Remove="11111111-2222-3333-4444-555555555555","66666666-7777-8888-9999-000000000000","11111111-2222-3333-4444-555555522555"}

That’s it!

Read more: Enable Microsoft Entra Self-Service Password Reset (SSPR) »

Conclusion

You learned how to enable cross-tenant message recall in Exchange Online. It’s a useful feature for many organizations. Instead of limiting message recall to users within the same tenant, administrators can now explicitly trust other Microsoft 365 tenants. Remember that some organizations may not want to enable this feature for compliance reasons.

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