When you have multiple email accounts configured in Outlook, every new message defaults to the primary account listed in your profile. If you frequently send from a secondary account — such as a work alias, shared mailbox, or personal address — you must manually switch the From field each time. This happens because Outlook assigns the first account in the account list as the default send account. This article explains how to change the default send account in Outlook for Windows so all new messages, replies, and forwards automatically use the account you choose.
Key Takeaways: Change Default Send Account in Outlook
- File > Account Settings > Account Settings > Change > More Settings > Advanced: The exact path to change the default send account in Outlook for Windows.
- Default send account dropdown: Select any configured email account to become the default for all new messages, replies, and forwards.
- Send From feature with shared mailboxes: Requires delegate permissions and manual selection per message — the default account setting does not apply to shared mailboxes.
Understanding the Default Send Account in Outlook
Outlook designates one email account as the default send account. This account appears in the From field of every new message, reply, and forwarded email. The default send account is always the first account you added to your Outlook profile. If you later add more accounts, Outlook does not automatically update the default.
The default send account setting is stored per Outlook profile, not per message. Changing it affects all new messages across all folders. This setting is separate from the default delivery location, which controls where incoming messages are saved.
To verify which account is currently the default, open a new message and check the From field. If the wrong account appears, you need to change the default send account in the account settings.
Prerequisites
Before you begin, confirm the following:
- You have at least two email accounts configured in your Outlook profile.
- You know the email address and password for each account.
- You are using Outlook for Windows (Microsoft 365, Outlook 2021, 2019, or 2016).
- You have administrative rights to your own Outlook profile.
Steps to Change the Default Send Account in Outlook
The following steps change the default send account for all new messages, replies, and forwards. The change takes effect immediately after you close the dialog.
- Open Account Settings
In Outlook, click the File tab. In the left pane, click Account Settings and then select Account Settings from the dropdown menu. - Select the Account You Want as Default
In the Account Settings dialog, click the E-mail tab if it is not already selected. You will see a list of all email accounts in your profile. Click the account you want to set as the default send account so it is highlighted. - Open the Change Dialog
Click the Change button above the account list. A new dialog opens showing the settings for the selected account. - Access More Settings
In the Change Account dialog, click More Settings in the lower-right corner. - Go to the Advanced Tab
In the Internet Email Settings dialog, click the Advanced tab at the top. - Set the Default Send Account
At the bottom of the Advanced tab, locate the Default send account dropdown. Click the dropdown and select the account you want to use as the default. This list shows all accounts currently configured in your profile. - Apply and Close All Dialogs
Click OK to close the Internet Email Settings dialog. Click Next in the Change Account dialog, then click Finish. Click Close in the Account Settings dialog.
Test the change by creating a new message. The From field should now display the account you selected as the default.
Limitations and Common Problems
Shared Mailboxes and Delegated Accounts
The default send account setting does not apply to shared mailboxes or mailboxes where you have delegate permissions. When you open a shared mailbox, Outlook uses the primary account as the send account. To send from a shared mailbox, you must manually add the shared mailbox address to the From field using the From button on the message ribbon. Alternatively, add the shared mailbox as an additional email account in your profile using Exchange Autodiscover — this allows you to select it in the default send account dropdown.
Default Send Account Changes Do Not Apply to Existing Drafts
Drafts created before you changed the default send account retain the original From address. Open each draft and manually change the From field if needed. Future drafts will use the new default.
Default Send Account vs Default Account in Outlook on the Web
The default send account setting in Outlook for Windows is independent of the default send account in Outlook on the web. Changing it in one client does not affect the other. You must configure this setting separately in each client.
Default Send Account Is Grayed Out
If the Default send account dropdown is grayed out, you are likely editing an Exchange account that does not support this setting. Only accounts using POP3, IMAP, or Exchange with the default send account feature enabled show this option. If the account is a Microsoft 365 group or a shared mailbox added as a secondary account, the dropdown may be disabled. In this case, add the account as a full email account in your profile instead.
Default Send Account vs Manual Send From: Key Differences
| Item | Default Send Account | Manual Send From |
|---|---|---|
| Setup location | File > Account Settings > Account Settings > Change > More Settings > Advanced | From button on the message ribbon |
| Applies to | All new messages, replies, and forwards | Only the current message |
| Supported account types | POP3, IMAP, Exchange with feature enabled | All account types including shared mailboxes |
| Requires permissions | No special permissions needed | Delegate or send-as permissions for shared mailboxes |
| Persistence | Persistent until changed again | Per-message only |
The default send account setting is the most efficient option if you consistently send from one secondary account. Use the manual Send From method only for occasional messages that must come from a different address.
After changing the default send account, you can also customize the From field for individual messages by clicking the From button in the message ribbon and selecting any account from the dropdown. This override works per message and does not affect the default setting.
For users who manage multiple shared mailboxes, consider adding each shared mailbox as an additional Exchange account in your profile. This makes them available in the default send account dropdown and eliminates the need to manually type the address each time.