*For this entry exists the more relevant or more recent entry MC679739
check before: 2025-08-01
Product:
Exchange, Microsoft Viva, Microsoft Viva Engage, Outlook, SharePoint
Platform:
Online, World tenant
Status:
Change type:
Admin impact, Feature update, Updated message, User impact
Details:
Summary:
Microsoft Viva Engage is updating its email sender domains from @yammer.com to @engage.mail.microsoft, starting September 2025 with completion by Q1 2026. A coexistence period will allow both domains. Admins should update rules referencing the old domains; no compliance issues identified.
Details:
Updated September 30, 2025: We have updated the timeline. Thank you for your patience.
Introduction
As part of the final phase of the Viva Engage rebranding, we're updating the email sender domains used for Viva Engage communications. This change ensures a consistent and secure brand experience across all surfaces and completes the transition from Yammer to Viva Engage.
This update was previously communicated in MC679739, "Yammer Rebranding to Viva Engage Domain Migration Update," in October 2023.
When this will happen
The email sender domain rollout will begin in early September 2025 (previously late August) for U.S. and EU tenants currently receiving messages from @yammer.com and @eu.yammer.com respectively. The entire rollout is expected to complete by Q1 CY2026 (previously late October).
A fallback/coexistence period will be in place between September (previously August) and by Q1 CY2026 (previously late October). during which both the old and new domains will be supported. During this time, some users within a tenant may receive emails from the old domain while others receive them from the new domain.
Change Category:
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Scope:
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Release Phase:
Created:
2025-07-19
updated:
2025-09-30
Task Type
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Docu to Check
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MS How does it affect me
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change history
| Date | Property | old | new |
| 2025-09-30 | MC Messages | Updated August 22, 2025: We have updated the content. Thank you for your patience.
Introduction As part of the final phase of the Viva Engage rebranding, we're updating the email sender domains used for Viva Engage communications. This change ensures a consistent and secure brand experience across all surfaces and completes the transition from Yammer to Viva Engage. This update was previously communicated in MC679739, "Yammer Rebranding to Viva Engage Domain Migration Update," in October 2023. When this will happen The email sender domain rollout will begin in early September 2025 (previously late August) for U.S. and EU tenants currently receiving messages from @yammer.com and @eu.yammer.com respectively. The entire rollout is expected to complete by the end of October 2025. A fallback/coexistence period will be in place between September (previously August) and the end of October, during which both the old and new domains will be supported. During this time, some users within a tenant may receive emails from the old domain while others receive them from the new domain. | Updated September 30, 2025: We have updated the timeline. Thank you for your patience.
Introduction As part of the final phase of the Viva Engage rebranding, we're updating the email sender domains used for Viva Engage communications. This change ensures a consistent and secure brand experience across all surfaces and completes the transition from Yammer to Viva Engage. This update was previously communicated in MC679739, "Yammer Rebranding to Viva Engage Domain Migration Update," in October 2023. When this will happen The email sender domain rollout will begin in early September 2025 (previously late August) for U.S. and EU tenants currently receiving messages from @yammer.com and @eu.yammer.com respectively. The entire rollout is expected to complete by Q1 CY2026 (previously late October). A fallback/coexistence period will be in place between September (previously August) and by Q1 CY2026 (previously late October). during which both the old and new domains will be supported. During this time, some users within a tenant may receive emails from the old domain while others receive them from the new domain. |
| 2025-09-30 | MC How Affect | The sender domain for Viva Engage emails will change as follows:
From @yammer.com to @engage.mail.microsoft for U.S. and global regions. From @eu.yammer.com to @eu.engage.mail.microsoft for European regions. These new domains are secured with industry-standard authentication protocols (e.g., SPF) to help prevent spoofing and ensure reliable delivery. To enhance security and reduce cross-tenant spam, sender addresses will now include a tenant-specific prefix. You may see emails from: noreply_tenant@engage.mail.microsoft (digests and delegate notifications) notifications_tenant@engage.mail.microsoft (community, storyline, and activity notifications) announcements_tenant@engage.mail.microsoft (leadership announcements) These changes apply to all Viva Engage tenants, regardless of license tier (e.g., Viva P1, P2), and affect all Viva Engage emails, including notifications, announcements, and digests. Third-party integrations (e.g., journaling, archiving, or routing systems) that rely on the @yammer.com domain for classification or authentication may be impacted. Any such configurations should be reviewed and updated to recognize the new domains. An example of a new Viva Engage email notification sent from the updated @engage.mail.microsoft domain | The sender domain for Viva Engage emails will change as follows:
From @yammer.com to @engage.mail.microsoft for U.S. and global regions. From @eu.yammer.com to @eu.engage.mail.microsoft for European regions. These new domains are secured with industry-standard authentication protocols (e.g., SPF) to help prevent spoofing and ensure reliable delivery. To enhance security and reduce cross-tenant spam, sender addresses will now include a tenant-specific prefix. You may see emails from: noreply_tenant@engage.mail.microsoft (digests, delegate, leader identification, community expert and other notifications) notifications_tenant@engage.mail.microsoft (community, storyline, and activity notifications) announcements_tenant@engage.mail.microsoft (leadership announcements) These changes apply to all Viva Engage tenants, regardless of license tier (e.g., Viva P1, P2), and affect all Viva Engage emails, including notifications, announcements, and digests. Third-party integrations (e.g., journaling, archiving, or routing systems) that rely on the @yammer.com domain for classification or authentication may be impacted. Any such configurations should be reviewed and updated to recognize the new domains. An example of a new Viva Engage email notification sent from the updated @engage.mail.microsoft domain |
| 2025-09-30 | MC Last Updated | 08/22/2025 22:59:10 | 2025-09-30T21:46:33Z |
| 2025-09-30 | MC Summary | Microsoft Viva Engage is updating its email sender domains from @yammer.com to @engage.mail.microsoft, starting September 2025 with a coexistence period until October. This change enhances security with tenant-specific prefixes and requires admins to update any custom email rules or integrations referencing the old domains. | Microsoft Viva Engage is updating its email sender domains from @yammer.com to @engage.mail.microsoft, starting September 2025 with completion by Q1 2026. A coexistence period will allow both domains. Admins should update rules referencing the old domains; no compliance issues identified. |
| 2025-08-23 | MC Messages | Updated August 5, 2025: We have updated the content. Thank you for your patience.
Introduction As part of the final phase of the Viva Engage rebranding, we're updating the email sender domains used for Viva Engage communications. This change ensures a consistent and secure brand experience across all surfaces and completes the transition from Yammer to Viva Engage. This update was previously communicated in MC679739, "Yammer Rebranding to Viva Engage Domain Migration Update," in October 2023. When this will happen The email sender domain rollout will begin in late August 2025 for U.S. and EU tenants currently receiving messages from @yammer.com and @eu.yammer.com respectively. The entire rollout is expected to complete by the end of October 2025. A fallback/coexistence period will be in place between August and the end of October, during which both the old and new domains will be supported. During this time, some users within a tenant may receive emails from the old domain while others receive them from the new domain. | Updated August 22, 2025: We have updated the content. Thank you for your patience.
Introduction As part of the final phase of the Viva Engage rebranding, we're updating the email sender domains used for Viva Engage communications. This change ensures a consistent and secure brand experience across all surfaces and completes the transition from Yammer to Viva Engage. This update was previously communicated in MC679739, "Yammer Rebranding to Viva Engage Domain Migration Update," in October 2023. When this will happen The email sender domain rollout will begin in early September 2025 (previously late August) for U.S. and EU tenants currently receiving messages from @yammer.com and @eu.yammer.com respectively. The entire rollout is expected to complete by the end of October 2025. A fallback/coexistence period will be in place between September (previously August) and the end of October, during which both the old and new domains will be supported. During this time, some users within a tenant may receive emails from the old domain while others receive them from the new domain. |
| 2025-08-23 | MC How Affect | The sender domain for Viva Engage emails will change as follows:
From @yammer.com to @engage.mail.microsoft for U.S. and global regions. From @eu.yammer.com to @eu.engage.mail.microsoft for European regions. These new domains are secured with industry-standard authentication protocols (e.g., SPF) to help prevent spoofing and ensure reliable delivery. To enhance security and reduce cross-tenant spam, sender addresses will now include a tenant-specific prefix. You may see emails from: noreply_tenant@engage.mail.microsoft (digests and delegate notifications) notifications_tenant@engage.mail.microsoft (community, storyline, and activity notifications) announcements_tenant@engage.mail.microsoft (leadership announcements) These changes apply to all Viva Engage tenants, regardless of license tier (e.g., Viva P1, P2), and affect all Viva Engage emails, including notifications, announcements, and digests. Third-party integrations (e.g., journaling, archiving, or routing systems) that rely on the @yammer.com domain for classification or authentication may be impacted. Any such configurations should be reviewed and updated to recognize the new domains. An example of a new Viva Engage email notification sent from the updated @engage.mail.microsoft domain | The sender domain for Viva Engage emails will change as follows:
From @yammer.com to @engage.mail.microsoft for U.S. and global regions. From @eu.yammer.com to @eu.engage.mail.microsoft for European regions. These new domains are secured with industry-standard authentication protocols (e.g., SPF) to help prevent spoofing and ensure reliable delivery. To enhance security and reduce cross-tenant spam, sender addresses will now include a tenant-specific prefix. You may see emails from: noreply_tenant@engage.mail.microsoft (digests and delegate notifications) notifications_tenant@engage.mail.microsoft (community, storyline, and activity notifications) announcements_tenant@engage.mail.microsoft (leadership announcements) These changes apply to all Viva Engage tenants, regardless of license tier (e.g., Viva P1, P2), and affect all Viva Engage emails, including notifications, announcements, and digests. Third-party integrations (e.g., journaling, archiving, or routing systems) that rely on the @yammer.com domain for classification or authentication may be impacted. Any such configurations should be reviewed and updated to recognize the new domains. An example of a new Viva Engage email notification sent from the updated @engage.mail.microsoft domain |
| 2025-08-23 | MC Last Updated | 08/05/2025 18:39:39 | 2025-08-22T22:59:10Z |
| 2025-08-23 | MC End Time | 11/30/2025 09:00:00 | 2025-12-15T09:00:00Z |
| 2025-08-23 | MC Summary | Microsoft Viva Engage is updating its email sender domains from @yammer.com to @engage.mail.microsoft, starting late August 2025 and completing by October 2025. This change enhances security with tenant-specific prefixes and requires admins to update any custom email rules or integrations referencing the old domains. | Microsoft Viva Engage is updating its email sender domains from @yammer.com to @engage.mail.microsoft, starting September 2025 with a coexistence period until October. This change enhances security with tenant-specific prefixes and requires admins to update any custom email rules or integrations referencing the old domains. |
| 2025-08-06 | MC Messages | Updated July 28, 2025: We have updated the timeline. Thank you for your patience.
Introduction As part of the final phase of the Viva Engage rebranding, we're updating the email sender domains used for Viva Engage communications. This change ensures a consistent and secure brand experience across all surfaces and completes the transition from Yammer to Viva Engage. This update was previously communicated in MC679739, "Yammer Rebranding to Viva Engage Domain Migration Update," in October 2023. When this will happen The email sender domain rollout will begin in late August 2025 for U.S. and EU tenants currently receiving messages from @yammer.com and @eu.yammer.com respectively. The entire rollout is expected to complete by the end of October 2025. A fallback/coexistence period will be in place between August and the end of October, during which both the old and new domains will be supported. This will be managed via an internal experiment. During this time, some users within a tenant may receive emails from the old domain while others receive them from the new domain. | Updated August 5, 2025: We have updated the content. Thank you for your patience.
Introduction As part of the final phase of the Viva Engage rebranding, we're updating the email sender domains used for Viva Engage communications. This change ensures a consistent and secure brand experience across all surfaces and completes the transition from Yammer to Viva Engage. This update was previously communicated in MC679739, "Yammer Rebranding to Viva Engage Domain Migration Update," in October 2023. When this will happen The email sender domain rollout will begin in late August 2025 for U.S. and EU tenants currently receiving messages from @yammer.com and @eu.yammer.com respectively. The entire rollout is expected to complete by the end of October 2025. A fallback/coexistence period will be in place between August and the end of October, during which both the old and new domains will be supported. During this time, some users within a tenant may receive emails from the old domain while others receive them from the new domain. |
| 2025-08-06 | MC Last Updated | 07/28/2025 19:26:24 | 2025-08-05T18:39:39Z |
| 2025-08-06 | MC Summary | Microsoft Viva Engage is updating its email sender domains from @yammer.com to @engage.mail.microsoft, starting late August 2025 with completion by October 2025. This includes tenant-specific prefixes for security. Admins should update any custom rules referencing the old domains; no compliance issues identified. | Microsoft Viva Engage is updating its email sender domains from @yammer.com to @engage.mail.microsoft, starting late August 2025 and completing by October 2025. This change enhances security with tenant-specific prefixes and requires admins to update any custom email rules or integrations referencing the old domains. |
| 2025-07-29 | MC Messages | Introduction
As part of the final phase of the Viva Engage rebranding, we're updating the email sender domains used for Viva Engage communications. This change ensures a consistent and secure brand experience across all surfaces and completes the transition from Yammer to Viva Engage. This update was previously communicated in MC679739, "Yammer Rebranding to Viva Engage Domain Migration Update," in October 2023. When this will happen The email sender domain rollout will begin in mid to late August 2025 for U.S. tenants currently receiving messages from @yammer.com. It will expand to EU tenants using @eu.yammer.com in early September. The entire rollout is expected to complete by the end of October 2025. A fallback/coexistence period will be in place between August and the end of October, during which both the old and new domains will be supported. This will be managed via an internal experiment. | Updated July 28, 2025: We have updated the timeline. Thank you for your patience.
Introduction As part of the final phase of the Viva Engage rebranding, we're updating the email sender domains used for Viva Engage communications. This change ensures a consistent and secure brand experience across all surfaces and completes the transition from Yammer to Viva Engage. This update was previously communicated in MC679739, "Yammer Rebranding to Viva Engage Domain Migration Update," in October 2023. When this will happen The email sender domain rollout will begin in late August 2025 for U.S. and EU tenants currently receiving messages from @yammer.com and @eu.yammer.com respectively. The entire rollout is expected to complete by the end of October 2025. A fallback/coexistence period will be in place between August and the end of October, during which both the old and new domains will be supported. This will be managed via an internal experiment. During this time, some users within a tenant may receive emails from the old domain while others receive them from the new domain. |
| 2025-07-29 | MC Title | Microsoft Viva Engage | Email sender domain migration from @yammer.com to @engage.mail.microsoft | (Updated) Microsoft Viva Engage | Email sender domain migration from @yammer.com to @engage.mail.microsoft |
| 2025-07-29 | MC Last Updated | 07/19/2025 01:38:58 | 2025-07-28T19:26:24Z |
| 2025-07-29 | MC MessageTagNames | Feature update, User impact, Admin impact | Updated message, Feature update, User impact, Admin impact |
| 2025-07-29 | MC Summary | Microsoft Viva Engage is changing its email sender domains from @yammer.com to @engage.mail.microsoft, starting August 2025 for U.S. tenants and completing by October 2025 globally. This update includes tenant-specific prefixes for enhanced security and requires admins to update any custom email rules or integrations referencing the old domains. | Microsoft Viva Engage is updating its email sender domains from @yammer.com to @engage.mail.microsoft, starting late August 2025 with completion by October 2025. This includes tenant-specific prefixes for security. Admins should update any custom rules referencing the old domains; no compliance issues identified. |
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