Send & Receive Issues

How to Stop or Cancel a Mail Merge in Outlook for Mac

Maira Mehtab Sep 27, 2026 870 views

Question details

The user needs to know how to stop an active mail merge process in Outlook for Mac to prevent remaining unsent messages from being delivered.

Product: Outlook for Mac
Device & OS: Mac
Scenario: Attempting to cancel an in-progress mail merge to stop batches of emails from sending.
Observed behavior: Emails are being sent automatically after initiating a mail merge. While sent messages cannot be recalled on Mac, pending messages can still be stopped.

Before you start

Act quickly to disconnect your internet connection. Messages that have already left your Outbox and been delivered cannot be recalled in Outlook for Mac.

Solution 1Recommended

Disconnect from the Internet and Clear the Outbox

The fastest way to stop outgoing messages is to cut off the internet connection and delete the pending emails from your Outbox.

Because Outlook for Mac lacks a recall feature for delivered emails, intercepting the messages before they leave your Outbox is the only way to stop a mail merge.

Disconnect from the internet

Immediately turn off your Mac's Wi-Fi or unplug your Ethernet cable to severe the connection to the mail server.

Enable Work Offline

Close and reopen Outlook, go to the Outlook menu at the top, and select 'Work Offline'.

Delete pending emails

Navigate to the 'Outbox' folder in the left sidebar, select all unsent mail-merge messages, and delete them.

Recall limitations: Outlook for Mac does not support recalling messages that have already been delivered. You can submit feedback through Microsoft's Office feedback page.

Solution 2

Cancel the Mail Merge Process in Word

Ensure the source application (Microsoft Word) is no longer attempting to send batches of emails to Outlook.

Free Microsoft Office alternative

Try WPS Office for Seamless Document Management

Looking for an easier way to handle documents and bulk mailings? WPS Office is a lightweight, free alternative to Microsoft Office that is fully compatible with Word, Excel, and PowerPoint formats on Mac.

1. Download WPS Office: Visit the official WPS website to download and install the free WPS Office suite for Mac.
2. Open WPS Writer: Launch WPS Writer to easily open your existing Microsoft Word (.docx) mail merge documents.
3. Use Mail Merge: Navigate to the Mailings tab to set up your data source and run bulk mailings efficiently.

Fully compatible with Microsoft Word (.docx), Excel (.xlsx), and PowerPoint (.pptx) formats.Built-in Mail Merge features in WPS Writer for effortless bulk mailings.Lightweight application that runs smoothly on macOS.Familiar tabbed interface makes switching from MS Office seamless.

microsoft office alternative - wps office

Frequently Asked Questions

Can I recall a sent mail-merge message in Outlook for Mac?

No, Outlook for Mac does not have a feature to recall messages once they have been delivered to the recipient's server.

Why should I enable 'Work Offline' to stop a mail merge?

Enabling 'Work Offline' disconnects Outlook from the mail server, stopping any pending emails in your Outbox from being processed and sent out.

How do I delete unsent mail merge emails?

Once you have disconnected from the internet or enabled 'Work Offline', open the Outbox folder in Outlook, select the unsent messages, and delete them.

Outlook & Email Problems