How to Stop a Mail-Enabled Security Group from Sending Copies to the Sender in Exchange Online
Question details
The user needs to prevent senders from receiving a copy of their own message when they send to a mail-enabled security group, while keeping group delivery active for other members and allowing external senders to continue emailing the group.
- Product
- Microsoft Exchange / Microsoft 365 mail-enabled security groups
- Device & OS
- not provided
- Scenario
- An Exchange administrator or group owner is evaluating group delivery behavior and needs sender-specific exclusions.
- Observed behavior
- Exchange expands the group and delivers the message to every member, including the sender; there is no built-in setting that excludes only the sender.
Confirm whether the affected object is a mail-enabled security group or a Microsoft 365 group, because the delivery and subscription settings are different. You need Exchange admin center or Microsoft 365 admin center access to check the group type and settings.
Check the Group Type in Exchange Admin Center
Use this to verify whether the current object is a mail-enabled security group and why it cannot exclude only the sender.
Go to the Exchange admin center in Microsoft 365 and expand Recipients, then select Groups.
Search for the group name and open its properties to check whether the group type is Mail-enabled security.
Confirm that a mail-enabled security group has no mailbox and expands to all members, which means there is no native sender-exclusion option.
Replace the Mail-Enabled Security Group with a Microsoft 365 Group and Configure Inbox Delivery Preferences
Use this when you want a mail-enabled object with its own mailbox and more flexible group delivery settings, as Microsoft 365 groups are the supported alternative.
Manage Office Tasks in WPS Office While You Rework Exchange Group Delivery
Because this Exchange group delivery behavior must be managed in Microsoft 365 or Exchange admin center, WPS Office is a free, lightweight, format-compatible alternative for the documents, spreadsheets, and email attachments involved while you administer Microsoft Office group settings.
- 1. Download WPS Office: Click Download WPS Office Free and install it on your Windows or macOS device.
- 2. Open Microsoft Office files: Use WPS Writer, WPS Spreadsheets, or WPS Presentation to open and edit DOCX, XLSX, and PPTX files related to group administration.
- 3. Use alongside Exchange Online: Keep Microsoft 365 admin center open for Exchange group settings and use WPS Office for documentation, lists, and email attachment files.
Frequently Asked Questions
Does a mail-enabled security group have a setting to exclude only the sender?
No. A mail-enabled security group does not have its own mailbox, and Exchange delivers the message to all members after group expansion. There is no native setting that excludes only the sender while keeping other group delivery unchanged.
Will switching to a Microsoft 365 group still allow external senders to email the group?
Yes. In Microsoft 365 group settings, you can allow external senders under delivery management, and they can send messages to the group email address.
How do I check if my group is a mail-enabled security group?
Open Exchange admin center, go to Recipients > Groups, search for the group, and inspect the group type column or properties. A mail-enabled security group is listed as Mail-enabled security rather than Microsoft 365 group.
Does unfollowing a Microsoft 365 group block only my own messages?
No. Unfollowing or stopping inbox delivery for a Microsoft 365 group stops group copies in your inbox generally. You can still open the group mailbox to read messages.
Can an Exchange transport rule stop the sender from receiving their own group message?
There is no reliable native transport rule for this because distribution group expansion occurs as part of delivery, and transport rules do not provide a sender-only exclusion after group expansion.
