When you click Reply in Outlook, Copilot may draft the message using a different email account than the one where the original email was received. This usually happens when you have multiple accounts configured in Outlook, such as a work account and a personal account. The root cause is that Copilot selects the default sending account instead of the account that received the original message. This article explains why Copilot picks the wrong account and provides a step-by-step fix to force Copilot to use the correct account for each reply.
Key Takeaways: Fix Copilot Drafting From Wrong Account in Outlook
- Outlook > File > Account Settings > Change default account: Setting your primary work account as default prevents Copilot from drafting replies using a secondary personal account.
- Reply-with-Copilot button > Check From field before sending: Manually verify the From address after Copilot generates the draft to catch account mismatches early.
- Outlook desktop app > Copilot pane > Reset Copilot context: Clearing the current conversation context forces Copilot to re-evaluate which account should be used for the reply.
Why Copilot Drafts Replies From the Wrong Account
Copilot in Outlook uses the default sending account defined in Outlook settings when it generates a draft reply. If you have multiple email accounts, such as a Microsoft 365 work account and a Gmail personal account, Copilot will always default to the account marked as default in Outlook. This happens even if the original email was sent to your secondary account. For example, if your Gmail account receives a message and you click Reply with Copilot, the draft may show your work email in the From field. Copilot does not automatically detect the recipient account that the original message was delivered to. It simply reads the reply context and applies the default account. This behavior occurs in both Outlook for Windows and Outlook on the web.
How Outlook Determines the Default Account
Outlook stores a primary sending account in its profile settings. When a new email is composed or a reply is initiated, Outlook fills the From field with the default account unless you manually change it. Copilot inherits this behavior. If you have never changed the default account, Outlook sets the first account you configured as the default. If you later added a second account, the first account remains the default unless you explicitly reassign it.
Steps to Fix Copilot Drafting From the Wrong Account
Follow these steps to ensure Copilot uses the correct account when drafting replies. Perform the steps in the order listed. Test after each step to see if the issue is resolved before moving to the next step.
- Set the correct default sending account in Outlook
Open Outlook. Go to File > Account Settings > Account Settings. In the Email tab, select the account you want Copilot to use for replies. Click Set as Default. Click Close. This change tells Outlook and Copilot which account to use when composing new messages and replies. If the original email was sent to a non-default account, you will need to manually change the From field on each reply until the default account is set correctly. - Manually change the From field after Copilot generates the draft
After clicking Reply with Copilot, wait for the draft to appear. In the message window, click the From button in the header area. Select the correct account from the dropdown list. Copilot will not automatically update the account selection, but the draft content remains. This is a quick workaround for individual replies. - Reset the Copilot conversation context
In Outlook, open the Copilot pane by clicking the Copilot icon on the Home tab. Click the three-dot menu in the pane. Select Reset. This clears the current session context and forces Copilot to reload account information when you start a new reply. After resetting, close the pane and try replying again. - Remove and re-add the secondary account
If the issue persists, remove the secondary account and add it again. Go to File > Account Settings > Account Settings. Select the secondary account that you do not want Copilot to use. Click Remove. Restart Outlook. Add the account again: File > Add Account. Enter the email address and follow the prompts. This refreshes the account metadata that Copilot reads. - Update Microsoft 365 and Outlook to the latest version
Outdated versions may contain bugs that affect account detection. Go to File > Office Account > Update Options > Update Now. Restart Outlook after the update completes. Check if Copilot now selects the correct account.
If Copilot Still Drafts From the Wrong Account
If the main steps did not resolve the issue, try these additional fixes for specific failure patterns.
Copilot Always Uses the First Account I Added, Even After Changing Default
This occurs when Outlook profile data is corrupted. Create a new Outlook profile. Go to Control Panel > Mail > Show Profiles. Click Add, name the profile, and configure your email accounts. Set this new profile as the default. Open Outlook with the new profile. Copilot will now read the default account from the fresh profile.
Copilot Drafts From a Shared Mailbox Instead of My Primary Account
Shared mailboxes added with Full Access permission can appear as sending accounts. Open Outlook. Go to File > Account Settings > Account Settings. Select the shared mailbox and click Remove. To send from the shared mailbox when needed, use the From field dropdown manually. Copilot will no longer default to the shared mailbox.
Copilot Uses the Wrong Account Only on One Device
Account settings are stored locally in the Outlook profile. If the issue happens only on a specific computer, that device likely has a different default account set. Repeat the steps in the main fix on that device. Ensure the device is signed into the same Microsoft 365 tenant as your other devices.
Copilot Account Selection Behavior: Outlook Desktop vs Outlook on the Web
| Item | Outlook Desktop (Windows) | Outlook on the Web |
|---|---|---|
| Default account source | Outlook profile default account | Primary account used to sign into the browser |
| Manual From field override | Click From button in message header | Click From dropdown in message header |
| Copilot context reset | Copilot pane > three-dot menu > Reset | Copilot pane > three-dot menu > Reset |
| Shared mailbox handling | Can be removed from account list | Addressed via mailbox permissions in admin center |
After applying these fixes, you can now control which account Copilot uses when drafting replies in Outlook. Start by setting the correct default account in Outlook settings. For one-off replies, manually adjust the From field. If the problem continues, reset the Copilot context or create a new Outlook profile. As an advanced tip, use Outlook Quick Steps to create a macro that automatically sets the From field to the account matching the original email folder, reducing manual steps for high-volume reply workflows.