Can Exchange Online Send an Automatic Reply to Every Incoming Email?
Question details
The user wants to configure Exchange Online to send an automatic response to every single email received from the same sender, rather than just once.
- Product
- Exchange Online
- Device & OS
- not provided
- Scenario
- Setting up out-of-office or automated response messages to acknowledge all incoming emails.
- Observed behavior
- By default, Exchange Online automatic replies limit responses to one per sender to prevent mail loops and unwanted spam traffic.
Verify that you have an active Microsoft 365 account with permissions to use Power Automate, as the default Exchange settings cannot be overridden directly.
Use Power Automate to Send a Reply to Every Email
Since Exchange natively restricts repeated automatic replies, creating a custom flow in Power Automate is the most effective way to guarantee a response to every single message.
Power Automate bypasses standard Exchange mail loop protections by utilizing cloud workflows. Be highly cautious when using this method, as replying to automated senders or mailing lists can create severe infinite mail loops.
Log in to your Microsoft 365 account and open the Power Automate application from the app launcher.
Click on 'Create' from the left menu and select 'Automated cloud flow'. Give your flow a descriptive name.
Search for the trigger 'When a new email arrives (V3)' under Office 365 Outlook and select it.
Click 'New step', search for 'Reply to email (V2)', and add it to your flow. Map the 'Message Id' field to the ID from the trigger step.
Draft the automatic response in the body of the reply action, save the flow, and ensure it is turned on to activate your new auto-responder.
Utilize Outlook Client Rules (Client-Side Only)
You can set up a client-side rule in the Outlook desktop app to reply to incoming messages with a specific template.
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Frequently Asked Questions
Why does Exchange Online limit automatic replies to the same sender?
Exchange Online limits automatic replies to prevent infinite mail loops. If two accounts with auto-replies email each other, a lack of limitation would cause them to continuously reply to each other, overloading the server.
Will a server-side Mail Flow Rule reply to every message?
No. Even if you set up an inbox rule on the server side (Exchange Admin Center) to reply with a message, Exchange generally retains the limitation of replying only once per sender per session to maintain server health.
How long does Exchange wait before it can send another automatic reply to the same person?
By default, the Out of Office assistant in Exchange tracks senders who have received a reply and will not send another one until the automatic reply is turned off and back on again, or after a specific server timeout period has passed.
