check before: 2025-11-17
Product:
Teams
Platform:
Online, World tenant
Status:
Change type:
User impact, Admin impact
Links:
Details:
Summary:
Starting November 17, 2025, organizations using premium custom HTML templates for Teams Events email notifications must set up and verify their sending domain in Microsoft 365. Without this, custom templates cannot be used, and event emails must originate from an authenticated, customer-owned domain.
Details:
[Introduction]
To improve the security and reliability of event email notifications in Microsoft Teams, we're updating how custom HTML templates are supported. Starting November 17, 2025, organizations using premium custom HTML templates for Teams Events must ensure their sending domain is properly set up and authenticated. This change helps reduce the risk of event emails being flagged as spam or phishing by ensuring they originate from trusted, customer-owned domains.
[When this will happen:]
This change will take effect on November 17, 2025.
Change Category:
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Scope:
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Release Phase:
Created:
2025-10-21
updated:
2025-10-21
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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summary for non-techies**
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Direct effects for Operations**
Loss of Customization
Without domain verification, organizations cannot use custom HTML templates for Teams Events, leading to a loss of branding and personalization in event communications.
- roles: Event Coordinator, Marketing Manager
- references: https://learn.microsoft.com/microsoft-365/admin/email/select-domain-to-use-for-email-from-microsoft-365-products?view=o365-worldwide
Increased Email Deliverability Issues
Emails sent without a verified domain may be flagged as spam, resulting in lower deliverability rates and potential loss of important communications.
- roles: IT Administrator, User
- references: https://learn.microsoft.com/microsoft-365/admin/email/select-domain-to-use-for-email-from-microsoft-365-products?view=o365-worldwide
Operational Disruption
Failure to set up the domain by the deadline may disrupt event planning and communication processes, affecting user engagement and attendance.
- roles: Event Coordinator, IT Support
- references: https://learn.microsoft.com/microsoft-365/admin/email/select-domain-to-use-for-email-from-microsoft-365-products?view=o365-worldwide
User Confusion
Users may be confused by the sudden inability to use custom templates, leading to frustration and decreased productivity during event planning.
- roles: User, Event Coordinator
- references: https://learn.microsoft.com/microsoft-365/admin/email/select-domain-to-use-for-email-from-microsoft-365-products?view=o365-worldwide
Increased Support Requests
The change may lead to an influx of support requests from users needing assistance with domain verification and setup, straining IT resources.
- roles: IT Support, Help Desk Staff
- references: https://learn.microsoft.com/microsoft-365/admin/email/select-domain-to-use-for-email-from-microsoft-365-products?view=o365-worldwide
Configutation Options**
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Opportunities**
Enhanced Email Deliverability
By setting up and verifying the sending domain, organizations can significantly reduce the chances of event emails being marked as spam. This improves the reliability of communication and ensures that important notifications reach the intended recipients without issues.
- next-steps: Implement a project plan to guide the domain verification process, including assigning responsibilities to IT staff and creating a timeline to complete the setup before the deadline.
- roles: IT Administrators, Marketing Team, Event Coordinators
- references: https://learn.microsoft.com/microsoft-365/admin/email/select-domain-to-use-for-email-from-microsoft-365-products?view=o365-worldwide
Improved Brand Recognition
Using a custom domain for email notifications reinforces brand identity and professionalism. This can enhance user experience as recipients are more likely to recognize and trust emails from their own organization rather than a generic Microsoft address.
- next-steps: Develop branding guidelines for email communications and ensure all event notifications adhere to these standards after domain verification.
- roles: Marketing Team, Brand Managers, Event Coordinators
- references: https://www.forbes.com/sites/forbesagencycouncil/2020/10/14/the-importance-of-brand-recognition-in-a-digital-world/?sh=4e6f0b1c7eeb
Streamlined IT Operations
The domain verification process can lead to a more organized IT infrastructure. By managing email domains centrally, IT can streamline email management, reduce the complexity of email routing, and improve overall operational efficiency.
- next-steps: Conduct an audit of current email domain settings and create a centralized management plan to maintain and monitor email domains post-verification.
- roles: IT Administrators, IT Operations Managers
- references: https://www.cio.com/article/243119/it-operations-how-to-improve-it-operations.html
Potentional Risks**
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IT Security**
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explanation for non-techies**
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