check before: 2026-03-30
Product:
Microsoft 365 admin center, Teams, Teams Premium
Platform:
Online, Web, World tenant
Status:
Change type:
Admin impact
Details:
Summary:
Custom domain configuration is no longer required for custom HTML editing in Teams event emails, effective immediately. However, configuring a custom domain is still recommended for better sender identity, email deliverability, and trust, especially for external audiences. Documentation will be updated accordingly.
Details:
We're clarifying our guidance around custom domain configuration for Teams event emails, based on customer feedback and recent questions.
In a previous Message Center post (MC1234575 and MC1176301), we communicated that configuring a custom domain was required to use custom HTML editing for event emails. Based on customer feedback, this is no longer mandatory effecting immediately.
[When this will happen:]
Effective immediately
Change Category:
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Scope:
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Release Phase:
Created:
2026-03-31
updated:
2026-03-31
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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MS Urgency
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MS workload name
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linked item details
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summary for non-techies**
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Direct effects for Operations**
Email Deliverability Issues
Without a custom domain, event-related emails will use Microsoft provided domains, which may appear unfamiliar to recipients, leading to lower email deliverability and higher chances of being flagged as spam.
- roles: Email Administrators, Event Coordinators
- references: https://techcommunity.microsoft.com/t5/microsoft-teams-blog/update-on-custom-domain-guidance-for-teams-event-emails/ba-p/3741230
User Trust and Experience
Not configuring a custom domain can result in a less trusted experience for attendees receiving event invitations, updates, and reminders, potentially affecting user engagement and attendance.
- roles: Event Coordinators, Marketing Teams
- references: https://techcommunity.microsoft.com/t5/microsoft-teams-blog/update-on-custom-domain-guidance-for-teams-event-emails/ba-p/3741230
Configutation Options**
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Data Protection**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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