How to Get a Reply All Confirmation Prompt in Outlook 365
Question details
The user is looking for a way to enable a confirmation prompt before sending an email using the 'Reply All' feature in Outlook 365 to prevent accidental mass emails.

- Product
- Microsoft Outlook 365
- Device & OS
- not provided
- Scenario
- Replying to emails with multiple recipients where the user wants a warning to prevent accidental 'Reply All' actions.
- Observed behavior
- Outlook 365 currently lacks a built-in confirmation prompt before executing a Reply All, and third-party add-ins do not reliably provide this functionality across all scenarios.
Verify your current version of Outlook 365 and check with your IT administrator, as some organizational policies may already restrict broad email replies or block third-party add-ins.
Implement Mail-Flow Rules to Restrict Broad Replies
While a direct pop-up prompt isn't natively available for individual users, IT administrators can set up mail-flow rules in Exchange to prevent or warn users about large Reply All actions.
This solution is ideal for organizations wanting to prevent accidental mass emails across the entire company. It requires administrator privileges in the Microsoft 365 environment.
Log in to the Exchange Admin Center with your global or Exchange administrator credentials.
Navigate to the 'Mail flow' section, select 'Rules', and click the '+' icon to add a new rule.
Apply conditions to trigger the rule, such as 'The recipient is' followed by a large distribution list or company-wide group.
Choose an action such as 'Reject the message with the explanation' or route the email to a moderator for approval before it is sent.

Utilize Bcc and MailTips to Prevent Accidental Replies
Use built-in Outlook features like MailTips or placing recipients in the Bcc field to mitigate the risk of unwanted Reply All emails.
Explore Custom VBA Macros or Legacy Add-ins
Advanced users can employ VBA macros to create a custom prompt, or search for legacy add-ins like Reply To All Monitor, though compatibility varies.
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Frequently Asked Questions
Why did Microsoft remove the Reply All warning from Outlook?
Microsoft hasn't completely removed it, but rather shifted focus to features like MailTips, which proactively warn users when replying to exceptionally large distribution lists instead of providing a universal pop-up prompt for every individual Reply All action.
Does Outlook on the web have a Reply All prompt?
No, Outlook on the web does not feature a native confirmation prompt for Reply All. However, it does offer an 'Undo Send' feature which gives you up to 10 seconds to cancel the email after clicking send.
What is the Reply To All Monitor add-in?
Reply To All Monitor was a popular third-party add-in designed for older versions of Outlook that provided a warning prompt before sending a broad reply. Its compatibility with the constantly updating Outlook 365 environment is no longer guaranteed.
Can I recall a message if I accidentally click Reply All?
Yes, if both you and the recipients are on the same Microsoft Exchange server within the same organization, you can attempt to recall the message by opening the sent email, navigating to 'Message' > 'Actions', and selecting 'Recall This Message'.




