No Ticket Needed

Appearance

4 min fix 10 min read Recently reviewedBeginner

By , IT support technician

Quick Answer

In classic Outlook, open File > Options > Mail and scroll to Replies and forwards. In new Outlook and on the web, open Settings > Mail > Compose and reply and set Reply or Reply all to Reply.

How to Change the Default Reply Behavior in Outlook ​

Applies to: Microsoft 365 (classic Outlook desktop, new Outlook, Outlook on the web)
Article Type: How-To
Last Updated: 2026-07-29

Summary ​

Outlook decides a lot about your replies before you type a word — whether the original message gets quoted, whether the reply opens in the reading pane or its own window, and which button sits under your cursor first. This article shows you where those settings live, how to make Reply win over Reply All, and what to do in the ten seconds after a Reply All goes wrong.

Prerequisites ​

  • A Microsoft 365 mailbox.
  • Access to classic Outlook desktop, new Outlook, or Outlook on the web. The settings differ between them, and each step below says which version it applies to.
  • No admin rights are needed for the built-in settings. Installing a third-party warning add-in does require approval — Step 5 gives you the wording to send IT.

Instructions ​

1. Open the Reply Settings in Classic Outlook ​

Every reply and forward behavior in the desktop app lives on one page.

  1. In classic Outlook, click the File tab in the top-left corner. The backstage view fills the window.
  2. Click Options at the bottom of the left sidebar. The Outlook Options dialog opens.
  3. Select Mail in the left sidebar of the dialog.
  4. Scroll down the right pane to the heading Replies and forwards. You now see two checkboxes, two dropdowns, and two text boxes — this group is everything Outlook does when you hit reply.

Note: New Outlook and Outlook on the web do not have this page. Their equivalent is Settings (the gear icon at the top-right) > Mail > Compose and reply, which carries a smaller set of options. Step 4 covers the one that matters most.

2. Choose How the Original Message Appears ​

This is the setting behind those replies where the quoted thread runs on for six screens.

  1. In the Replies and forwards group, click the When replying to a message dropdown.
  2. Pick the behavior you want:
    • Include original message text — the default. The thread appears below your cursor as plain quoted text.
    • Include and indent original message text — the same, shifted right so your new text stands out.
    • Prefix each line of the original message — puts a marker at the start of every quoted line. The marker is set in the Preface each line in a plain text message with: box below, and defaults to >.
    • Attach original message — the thread arrives as a separate attachment instead of inline text.
    • Do not include original message — your reply opens blank, with only the recipient and subject filled in.
  3. Click the When forwarding a message dropdown and set it the same way. Forwarding has no Do not include original message option, because a forward with no content would be an empty email.
  4. To label your inline comments, type your name or initials in the Preface comments with: box. Outlook inserts that text whenever you type directly inside the quoted thread.
  5. Click OK at the bottom of the Outlook Options dialog.

Verification: Open any message in your inbox and click Reply. The quoted text below your cursor now matches the option you picked — indented, prefixed, attached, or gone entirely.

3. Open Replies in Their Own Window ​

Inline reply keeps you in the reading pane, which is fine for one line and painful for anything longer.

Classic Outlook (permanent setting):

  1. Return to File > Options > Mail > Replies and forwards.
  2. Check Open replies and forwards in a new window.
  3. Check Close original message window when replying or forwarding if you want Outlook to tidy up behind you.
  4. Click OK. Your next reply opens as a full message window with its own Send button and ribbon.

New Outlook and Outlook on the web (per message):

  1. Click Reply on a message. The reply opens inline at the bottom of the reading pane.
  2. Click the pop out icon — the small diagonal arrow at the top-right of the reply area.
  3. The reply detaches into its own window. There is no permanent setting for this in these versions, so the pop out is a per-message choice.

4. Make Reply the Default Instead of Reply All ​

This is the setting most people are looking for when they land here.

New Outlook and Outlook on the web:

  1. Click the Settings gear icon at the top-right of the window.
  2. Select Mail in the left column of the Settings panel, then Compose and reply.
  3. Scroll to the Reply or Reply all section.
  4. Select Reply.
  5. Click Save. The response button on every message now reads Reply, and Reply all moves behind the dropdown arrow next to it — one deliberate extra click away.

Classic Outlook:

Classic Outlook has no setting that swaps the default button, so the reliable defence is your keyboard. The reply commands sit close together on purpose, and knowing which is which stops the reflex click:

  • Ctrl + R — Reply to the sender only.
  • Ctrl + Shift + R — Reply All.
  • Ctrl + F — Forward.

Tip: Train the habit on low-stakes mail for a week and Ctrl + R becomes automatic. The reflex you are replacing is clicking whatever button your mouse lands on, and that button is often Reply All.

5. Add a Reply All Warning or Redirect Replies ​

Prompts and warnings catch the mistakes that habit does not.

The built-in prompt for large recipient lists: New Outlook and Outlook on the web show a warning above the compose area when you reply to everyone on a message with a large recipient list, asking whether you meant to respond to all of them. It appears on its own — no setting to turn on. Read it rather than dismissing it, because it is counting recipients you cannot see on screen.

Reply-all storm protection: Exchange Online watches for runaway threads across the whole organization and blocks further reply-alls on a message once a storm starts, bouncing them back to the sender as non-delivery reports. This is automatic, it is not something you configure, and it explains the occasional "your message wasn't delivered" reply to a company-wide thread.

Stop Reply All on messages you send (classic Outlook):

  1. Compose your message as usual.
  2. Click the Options tab in the message window.
  3. Click Direct Replies To in the More Options group. The Properties dialog opens.
  4. Under Delivery options, check Have replies sent to and enter the single address that replies should go to.
  5. Click Close, then send. Replies now route to that one address regardless of which reply button the recipient presses.

Third-party warning add-ins: Add-ins that pop a confirmation box before any Reply All exist for both classic and new Outlook, and most organizations require approval before you can install one. Send IT this: "Please review a Reply All confirmation add-in for Outlook and deploy it to my mailbox if it meets our security review." Naming the outcome rather than a specific product gets a faster answer, because they already know which vendors are approved.

6. Recover from an Accidental Reply All ​

Speed matters more than anything else here. Work down this list in order.

  1. Look at the bottom of the window immediately. New Outlook and Outlook on the web show an Undo button for a few seconds after sending — click it and the message returns to your drafts, unsent.
  2. If the Undo window has closed, open Sent Items and attempt a recall. Full steps are in How to Recall or Replace a Sent Email in Outlook. Recall works only when you and every recipient are inside the same organization on Exchange, and only on messages nobody has opened yet.
  3. Extend your safety net so the next one is catchable: in new Outlook or Outlook on the web, open Settings > Mail > Compose and reply, scroll to Undo send, and move the slider to its maximum of 10 seconds. Click Save.
  4. If the message went out and cannot be pulled back, send one short correction to the same thread. Keep it factual and brief — a second apology email to a large list doubles the noise you are trying to undo.

Verification: Send a test message to yourself, click Send, and confirm the Undo button appears at the bottom of the window and stays visible for the full delay you set.

Troubleshooting ​

WARNING

Changing your reply default protects you, not the people you email. Anyone replying to a message you sent to a large distribution list can still hit Reply All from their own mailbox. For announcements going to a wide audience, put every recipient in BCC or use the Direct Replies To option in Step 5 — those are the only controls that hold on the recipient's side.

Symptom / ErrorPotential CauseSolution
No "Replies and forwards" section under File > Options > MailRunning new Outlook, not classicNew Outlook has no File tab. Use Settings > Mail > Compose and reply instead, and see Understanding Outlook Versions — Classic vs. New vs. Web to confirm which version you are in.
"Reply or Reply all" setting is missingLooking in classic OutlookThis setting exists only in new Outlook and Outlook on the web. In classic Outlook, use Ctrl + R for Reply as described in Step 4.
Reply still opens in the reading pane after checking the boxSetting applied to a different profileThe checkbox is per Outlook profile. Close and reopen Outlook, then confirm File > Options > Mail still shows Open replies and forwards in a new window checked.
Quoted text still appears after choosing "Do not include original message"Replying from the web or mobile appThe classic Outlook setting does not sync to other clients. Each app carries its own reply settings, so change it in whichever one you are actually using.
Direct Replies To has no effectRecipient used Forward, not ReplyHave replies sent to redirects replies only. A forwarded copy starts a new message and ignores it.
Warning add-in does not appear in the ribbonAdd-in not deployed to your mailboxAdd-ins deployed by IT can take up to 24 hours to appear. Restart Outlook first, then send IT this: "Please confirm the Reply All add-in is assigned to my mailbox — it is not showing in my ribbon."