Microsoft Teams: Upcoming change to voicemail message delivery by email

Microsoft Teams will change voicemail email delivery by early March 2027, moving caller info from the email From field to the Subject line and allowing organizations to use their own domains for sending. Organizations should update mail-flow rules accordingly; no new compliance requirements arise. We’re changing how Microsoft Teams voicemail messages are delivered by email to improve security and give organizations more control over sender identity. Organizations will be able to send voicemail notifications from their own domain and apply existing SPF, DKIM, DMARC, and domain-protection policies to help prevent spoofing and impersonation. Supporting organization-owned sending domains requires a new voicemail email delivery solution. Caller information will move from the email From field to the Subject line and remain in the message body. Rollout schedule General Availability (Worldwide): Rollout is currently estimated to begin in early March 2027 and complete by late June 2027. Note: This schedule is subject to change. We will publish an updated Message center communication with the confirmed rollout timeline and required customer actions. Impact on your organization Who is affected Organizations that are using Teams Calling. Platforms and services Microsoft Teams Voicemail Exchange Online What will happen The From field in voicemail email messages will no longer contain the caller’s name, phone number, or email address. The sender address will support Bring Your Own Domain (BYOD), allowing organizations to use their own domain for voicemail email delivery. Caller information will move to the Subject line and remain in the message body. Organizations should review and prepare to update mail-flow rules, allowlists, filtering, routing, or automation based on the current voicemail sender identity or domain. Caller information will continue to appear in Teams as it does today, while the underlying email delivery and sender domain will change. Component Today After the change E-mail From field Identified caller: John Smith “[email protected]” or unidentified caller: “+19371817273” [email protected] “Microsoft Teams” no-reply@<default tenant domain> or “Microsoft Teams” <custom tenant domain> when configured E-mail Subjectfield (personal voicemail) Voice mail (22 seconds) Identified: John Smith (+19371817273) – Voicemail (00:22) Unidentified: +19371817273 – Voicemail (00:22) E-mail domain “skype.voicemail.microsoft.com” for PSTN calls or tenant […]

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