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title: Cannot use reply all with Microsoft 365 groups
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description: Discusses an error message returned by Exchange Online when a member of a Microsoft 365 group uses reply all to respond to an email message sent to the group.
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title: Can't select reply all to messages from Microsoft 365 groups
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description: Discusses an error message returned by Exchange Online when you select Reply All to an email message that was sent to a Microsoft 365 group.
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author: cloud-writer
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ms.author: meerak
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manager: dcscontentpm
@@ -16,22 +16,18 @@ appliesto:
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ms.date: 11/05/2025
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---
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# Can't use reply all in email messages with Microsoft 365 groups
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# Can't select Reply All in email messages with Microsoft 365 groups
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Consider the following example. You are a member of a Microsoft 365 group and you receive an email message addressed to the group. Using Outlook on the web or new Outlook, you attempt to reply all to the message. You receive an error message similar to the following from Exchange Online.
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Consider the following example. You're a member of a Microsoft 365 group and you receive an email message addressed to the group. Using Outlook on the web or new Outlook, you select **Reply All** and then send the message. You receive an error that states that Exchange Online "Couldn't send this message."
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:::image type="content" source="media/cannot-reply-all-with-microsoft-365-groups/cannot-reply-all-with-microsoft-365-groups.png" alt-text="Image of the error message returned by Exchange Online when you attempt to reply all to a message sent to a Microsoft 365 group.":::
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If you select **More details**, you receive this information.
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Where "Re: test at 7:43" is the subject of your message.
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Also, if you select **More details**, you receive more information that might be confusing.
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“This message can't be sent because it no longer exists. It can only be discarded. Make sure you copy the contents of the message before you discard if you want to use them later.”
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"This message can't be sent because it no longer exists. It can only be discarded. Make sure you copy the contents of the message before you discard if you want to use them later."
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## Cause
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Reply all is not supported by design because a group uses a single email address.
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**Reply All** isn't supported by design because a group uses a single email address.
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## Workaround: Use reply instead of reply all
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## Workaround
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To respond to an email sent by a member of a Microsoft 365 group and have the email sent to the entire group, use reply instead of reply all.
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To respond to an email sent by a member of a Microsoft 365 group and have the email sent to the entire group, select **Reply** instead of **Reply All**.
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