Microsoft Teams: Guest invitation emails will be sent from the inviter’s email address

🚨 The Signal: Teams guest invitation emails will now appear to originate from the inviter's email address, not a Microsoft no-reply address. This change aims to improve trust and direct communication, but it alters the email sender identity for external collaboration.

The Impact

External recipients and security teams are affected by a change in sender identity for guest invitations, potentially increasing phishing risk.

• External recipients: May perceive invitations as more legitimate, increasing susceptibility to sophisticated phishing if not properly informed.
• Security teams: Need to update user awareness training regarding legitimate guest invitation sender patterns to mitigate phishing risks.
• Helpdesk/Support teams: Must be prepared for user queries about the new sender address and potential phishing reports.

The Action

1. Communicate to users that Teams guest invitations will now come from their email address, not a Microsoft no-reply address.
2. Update security awareness training materials to reflect the new sender identity for legitimate Teams guest invitations.
3. Inform helpdesk and support teams about the change to handle user inquiries and potential phishing reports effectively.

Domain: Teams · Impact: medium · Workload: Teams