When you send an email from Outlook, replies normally go to the address in the From field. But sometimes you need replies to arrive at a different email address for just one message. This is called overriding the Reply-To header. The Reply-To field tells the recipient’s email client where to send the reply instead of the original sender address. This article explains how to set a custom Reply-To address on a single outgoing message in Outlook for Windows.
Key Takeaways: Setting Reply-To on One Message in Outlook
- New Email > Options > More Options (dialog launcher): Opens the Message Options dialog where you can manually enter a custom Reply-To address.
- Properties button in an open message: Lets you change the Reply-To field on a message you already started composing.
- Reply-To field in the Internet Headers section: The exact field name you must type to set the override correctly.
How the Reply-To Header Works in Outlook
The Reply-To header is an optional email field. When you send a message without it, the recipient’s reply goes to the sender’s address in the From field. When you add a Reply-To address, replies go to that address instead. This is useful when you send from a shared mailbox or alias but want replies sent to your personal inbox.
Outlook does not show the Reply-To field by default in the compose window. You must open the Message Options dialog to access it. This method works for a single message only. It does not change your account settings or affect future messages.
You need an existing email account configured in Outlook. Any Outlook profile type works: Microsoft 365, Exchange, IMAP, or POP3. The Reply-To override works the same way for all account types.
Steps to Set a Reply-To Address on a Single Message
Follow these steps to add a custom Reply-To address to one outgoing email in Outlook for Windows.
- Create a new email message
Click New Email on the Home tab. The compose window opens. - Open the Options tab
In the compose window, click the Options tab on the ribbon. - Open the Message Options dialog
In the More Options group, click the small dialog launcher arrow in the bottom-right corner. This opens the Properties dialog for the message. - Locate the Internet Headers section
In the Properties dialog, find the Internet Headers text box. This box shows the raw email headers of the message. - Add the Reply-To header
Type the following line into the Internet Headers box:Reply-To: email@example.com
Replaceemail@example.comwith the actual email address you want replies to go to. Do not add spaces around the colon. Press Enter after the line to move to a new row. - Close the Properties dialog
Click Close to save the header change and return to the compose window. - Send the message
Complete the To, Subject, and body fields as usual. Click Send.
The Reply-To header is now embedded in the outgoing message. When the recipient clicks Reply, the reply address is the one you typed, not your original sender address.
If Outlook Still Has Issues After the Main Fix
The Reply-To header does not appear in the sent message
If the recipient reports that replies still go to your original address, the header might not have been saved correctly. Open the sent message in your Sent Items folder. Double-click it, then go to File > Info > Properties. Look in the Internet Headers box. If you do not see a line starting with Reply-To:, repeat the steps and make sure you press Enter after typing the line. Do not leave the line empty or include extra spaces.
You need to remove the Reply-To header before sending
If you added the header but changed your mind, open the Properties dialog again. Delete the Reply-To: line from the Internet Headers box. Click Close. The message now sends without the override.
Outlook adds a second Reply-To header automatically
Some Outlook configurations or third-party add-ins can inject their own Reply-To header. If you see duplicate Reply-To lines in the sent message headers, the recipient’s email client may use the first one it encounters. Check your add-ins in File > Options > Add-Ins. Disable any add-in that modifies headers and test again.
Single Message Reply-To vs Account-Level Settings
| Item | Single Message Reply-To Override | Account-Level Reply-To Setting |
|---|---|---|
| Scope | One email only | All messages from that account |
| Setup location | Message Options dialog in compose window | File > Account Settings > Account > Change > More Settings |
| Header method | Manual entry in Internet Headers box | Outlook adds the header automatically |
| Use case | Temporary or one-off redirection | Permanent redirection for shared mailboxes |
| Risk of error | Higher due to manual typing | Lower because Outlook manages the header |
The single message override is best for occasional use. For permanent Reply-To changes, configure the setting at the account level. Open File > Account Settings > Account Settings. Select your account and click Change. Click More Settings, then the Advanced tab. Under Reply E-mail, enter the address. Click OK twice. All future messages from this account will use that Reply-To address.
You can now set a custom Reply-To address on a single message in Outlook for Windows. Use this method when you need replies to go to a different address for one email without changing your account settings. For repeated use, consider adding the Reply-To button to the Quick Access Toolbar. Right-click the ribbon and select Customize Quick Access Toolbar. In the Choose commands from list, select All Commands. Find Reply-To and click Add. Click OK. The button appears in the top-left corner of Outlook for quick access on any message.