check before: 2025-04-15
Product:
Exchange, Microsoft 365 Apps, Outlook
Platform:
Android, iOS, Online, US Instances, World tenant
Status:
Launched
Change type:
New feature, Updated message, User impact
Links:
Details:
Summary:
Microsoft Outlook for iOS/Android will soon warn users when emailing a large number of recipients, with the default threshold set at 25 people. The rollout starts in early May 2025 and completes by early July 2025. Admins can customize the large audience size. No admin action is required.
Details:
Updated July 1, 2025: We have updated the timeline below. Thank you for your patience.
Coming soon for Microsoft Outlook for iOS/Android: Users will receive a warning when they are about to send an email to a large number of recipients, which can help them make the correct decision about wording, tone, and content.
[When this will happen:]
General Availability (Worldwide, GCC, GCC High): We will begin rolling out early May 2025 (previously mid-April) and expect to complete by early July 2025 (previously early June).
Change Category:
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Scope:
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Release Phase:
General Availability
Created:
2025-03-27
updated:
2025-07-02
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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linked item details
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Pictures
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summary for non-techies**
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Direct effects for Operations**
User Experience Impact from Large Audience Warnings
Users may experience confusion or frustration when receiving warnings about large recipient lists, potentially leading to delays in communication as they reconsider their email content.
- roles: End Users, Communication Managers
- references: https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/mailtips/mailtips, https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/mailtips/configure-large-audience-size
Operational Impact on Email Communication
The automatic implementation of large audience warnings may disrupt established communication patterns, causing users to alter their emailing habits without prior notice or training.
- roles: IT Support Staff, End Users
- references: https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/mailtips/mailtips, https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/mailtips/configure-large-audience-size
Configutation Options**
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explanation for non-techies**
Microsoft Outlook for iOS and Android is introducing a new feature that will alert users when they are about to send an email to a large group of people. Imagine you're at a large party, and you want to make an announcement. Before you speak, someone taps you on the shoulder and reminds you to consider your words carefully because everyone in the room will hear you. This new feature in Outlook acts like that gentle reminder, helping users think twice about the message they are about to send to a big audience.
The default setting for what counts as a "large audience" is 25 recipients, but this can be adjusted by your organization's administrators if needed. This feature is designed to help users be more mindful of their communication, ensuring that the tone and content are appropriate for a wider audience.
When composing an email that hits this threshold, users will see a notification bar above the address line. By tapping on this bar, they can get more information about the large audience warning. This change will be implemented automatically, so no action is required from administrators, although they might want to inform their teams about this update and adjust the threshold if necessary.
This update is set to roll out between early May and early July 2025, and it will be available worldwide. It's a helpful tool for anyone who regularly communicates with large groups, ensuring that messages are sent with the right level of consideration and professionalism.
** AI generated content. This information must be reviewed before use.
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change history
| Date | Property | old | new |
| 2025-07-02 | MC Last Updated | 04/22/2025 16:42:40 | 2025-07-01T22:08:13Z |
| 2025-07-02 | MC Messages | Updated April 22, 2025: We have updated the timeline below. Thank you for your patience.
Coming soon for Microsoft Outlook for iOS/Android: Users will receive a warning when they are about to send an email to a large number of recipients, which can help them make the correct decision about wording, tone, and content. [When this will happen:] General Availability (Worldwide, GCC, GCC High): We will begin rolling out early May 2025 (previously mid-April) and expect to complete by early June 2025 (previously mid-May). | Updated July 1, 2025: We have updated the timeline below. Thank you for your patience.
Coming soon for Microsoft Outlook for iOS/Android: Users will receive a warning when they are about to send an email to a large number of recipients, which can help them make the correct decision about wording, tone, and content. [When this will happen:] General Availability (Worldwide, GCC, GCC High): We will begin rolling out early May 2025 (previously mid-April) and expect to complete by early July 2025 (previously early June). |
| 2025-07-02 | MC End Time | 07/31/2025 09:00:00 | 2025-08-18T09:00:00Z |
| 2025-07-02 | MC Summary | Microsoft Outlook for iOS/Android will soon warn users when emailing a large number of recipients. The rollout starts in early May 2025 and completes by early June 2025. The default threshold is 25 recipients, which can be customized. No admin action is required, but user notification is recommended. | Microsoft Outlook for iOS/Android will soon warn users when emailing a large number of recipients, with the default threshold set at 25 people. The rollout starts in early May 2025 and completes by early July 2025. Admins can customize the large audience size. No admin action is required. |
| 2025-04-23 | MC MessageTagNames | New feature, User impact | Updated message, New feature, User impact |
| 2025-04-23 | MC Summary | Microsoft Outlook for iOS/Android will introduce large audience warnings starting mid-April 2025. Users with MailTips support can opt in to receive warnings when emailing over 25 recipients. Admins can customize this threshold. The rollout is automatic, with no required admin action. Notify users and update documentation as needed. | Microsoft Outlook for iOS/Android will soon warn users when emailing a large number of recipients. The rollout starts in early May 2025 and completes by early June 2025. The default threshold is 25 recipients, which can be customized. No admin action is required, but user notification is recommended. |
| 2025-04-23 | MC Last Updated | 03/27/2025 00:40:21 | 2025-04-22T16:42:40Z |
| 2025-04-23 | MC Messages | Coming soon for Microsoft Outlook for iOS/Android: Users will receive a warning when they are about to send an email to a large number of recipients, which can help them make the correct decision about wording, tone, and content.
[When this will happen:] General Availability (Worldwide, GCC, GCC High): We will begin rolling out mid-April 2025 and expect to complete by mid-May 2025. | Updated April 22, 2025: We have updated the timeline below. Thank you for your patience.
Coming soon for Microsoft Outlook for iOS/Android: Users will receive a warning when they are about to send an email to a large number of recipients, which can help them make the correct decision about wording, tone, and content. [When this will happen:] General Availability (Worldwide, GCC, GCC High): We will begin rolling out early May 2025 (previously mid-April) and expect to complete by early June 2025 (previously mid-May). |
| 2025-04-23 | MC Title | Microsoft Outlook for iOS/Android: Large audience warnings for users | (Updated) Microsoft Outlook for iOS/Android: Large audience warnings for users |
| 2025-04-23 | MC How Affect | After this rollout, users with MailTips support can opt in to receive a warning when they are about to email a large number of recipients. The default large audience size is 25 people. Learn how admins can define a custom large audience threshold for their organization: Configure the large audience size for your organization in Exchange Online | Microsoft Learn
Users with MailTips support can opt in to receive the large email warning: When composing an email to a large audience, users will see an info bar above the address line and can tap the info bar to learn more: This change will happen automatically | After this rollout, users with MailTips support can opt in to receive a warning when they are about to email a large number of recipients. The default large audience size is 25 people. Learn how admins can define a custom large audience threshold for their organization: Configure the large audience size for your organization in Exchange Online | Microsoft Learn
When composing an email to a large audience, users will see an info bar above the address line and can tap the info bar to learn more: This change will happen automatically |
Last updated 4 months ago ago
