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MC946793 Stay informedUpdated messageFeature updateUser impact

Microsoft Outlook for iOS and Android: Enhanced external recipient determinations

From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.
Exchange OnlineMicrosoft 365 apps
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Rollout

Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".

Schedule dates changed in the text

Date phrases in schedule sentences differ between the versions we saw
  • Seen 2 Apr 2025 late April 2025
  • Seen 5 Feb 2025 late January 2025, late February 2025 → mid-February 2025
  • Seen 16 Jan 2025 early January 2025 → late February 2025

Read from date phrases in Microsoft's text, not from notice metadata. A changed phrase can be a moved rollout, a new milestone or just rewording; "What changed" below shows which.

What the notice says

Microsoft’s text, safely structured

Updated April 2, 2025: We have updated the rollout timeline below. Thank you for your patience.

The ability to distinguish between internal and external recipients is crucial for maintaining secure and efficient communication. This update will improve offline accuracy and overall performance of the External Recipients MailTips feature on Microsoft Outlook for iOS and Android.

This post is associated with MC834102 External recipients MailTip offline behavior update for Microsoft Outlook for iOS and Android (published July 2024, updated to cancel November 2024).

When this will happen

General Availability (Worldwide, GCC, GCC High): We will begin rolling out mid-February 2025 (previously late January) and expect to complete by late April 2025 (previously mid-March)

How this will affect your organization

After this rollout, organizations that have enabled External Recipient MailTips feature will benefit from the client retrieving and caching internal domain information from the Microsoft Exchange Server. This improves accuracy for users who are offline or have unreliable internet connections and overall feature performance.

Before this rollout, Outlook for iOS and Android calls the MailTips service for an External Recipient determination when users add recipients to an email. When the user is offline, we are unable to reach the MailTips service, so domain comparison is used.

This change is on by default.

What you need to do to prepare

This change will happen automatically by the specified date. No admin action is required. Please notify your users about this change and update relevant documentation.

Learn more: MailTips in Exchange Online | Microsoft Learn (will be updated before rollout)

What changed

Between archive captures, newest first

  1. Updated February 5,April 2, 2025: We have updated the rollout timeline below. Thank you for your … rolling out mid-February 2025 (previously late January) and expect to complete by mid-Marchlate April 2025 (previously late February)mid-March) How this will affect your organization: After this rollout, organizations that have …

    • Tags Feature update, User impact → Updated message, Feature update, User impact

    Updated January 16,February 5, 2025: We have updated the rollout timeline below. Thank you for your … happen: General Availability (Worldwide, GCC, GCC High): We will begin rolling out late January mid-February 2025 (previously earlylate January) and expect to complete by late February 2025 (previously January).mid-March (previously late February) How this will affect your organization: After this rollout, organizations that have …

  3. Updated January 16, 2025: We have updated the rollout timeline below. Thank you for your patience. The ability to distinguish between internal and external recipients is crucial for … happen: General Availability (Worldwide, GCC, GCC High): We will begin rolling out earlylate January 2025 (previously early January) and expect to complete by late January 2025.February 2025 (previously January). How this will affect your organization: After this rollout, organizations that have …

  4. · first version seen

Learn more

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