What the "From" field does and why you might need it
The "From" field in Outlook is the email address that appears in the sender line when someone receives your message. By default, Outlook shows only your primary email account. If you have multiple email addresses — perhaps a work account, a personal account, and a business account — you can add them to Outlook so you can send from whichever one fits the message you're writing.
Adding a "From" address means you're telling Outlook about another email account you own and want to send from. This is different from forwarding mail or setting up an entirely separate account. You're simply giving Outlook permission to send messages under a different email identity that you control.
The steps differ slightly depending on whether you use Outlook on Windows, Mac, or the web version. This guide covers all three.
Key Takeaways
- You can only add a "From" address if you own that email account or have permission from the account owner.
- Outlook on Windows and Mac require you to add the account through Settings, while Outlook on the web uses a dropdown menu in the compose window.
- After you add a "From" address, you may need to restart Outlook or wait a few minutes before it appears in the dropdown.
- Some email providers require you to generate an app password instead of using your regular password when adding the account to Outlook.
Adding a "From" address in Outlook on Windows
Open Outlook and go to File in the top-left corner. Click Info, then look for Account Settings and click the dropdown arrow next to it. Select Account Settings from the menu that appears.
In the Account Settings window, you'll see the Email tab at the top. Click it if it's not already selected. You should see your current email account listed. Click the New button to add another account.
A setup wizard will open. Enter the email address you want to add, then click Connect. Outlook will try to detect your email provider automatically. If it succeeds, enter your password and click Next. If it doesn't recognize the provider, you'll need to enter the server details manually — your email provider's support page will have this information.
Once the account is added, close the Account Settings window. The new address should now appear in the From dropdown when you compose a new message. If it doesn't show up right away, close and reopen Outlook.
Adding a "From" address in Outlook on Mac
Click Outlook in the menu bar at the top of the screen, then select Preferences. In the Preferences window, click Accounts.
You'll see your current email account listed on the left. Click the plus sign at the bottom of the account list to add a new one. A dialog box will open asking for your email address and password. Enter the address you want to add and click Continue.
Outlook will attempt to set up the account automatically. If it succeeds, you're done — close the Preferences window. If Outlook can't find your email provider, you'll see a prompt to enter server information manually. Check your email provider's support documentation for the correct incoming and outgoing server addresses.
After the account is added, the new address will appear in the From dropdown the next time you compose a message. If you don't see it immediately, quit and reopen Outlook.
Adding a "From" address in Outlook on the web
Outlook on the web (Outlook.com accessed through a browser) handles multiple addresses differently. You don't add separate accounts in settings. Instead, you add aliases — alternate email addresses tied to your main account.
Click the gear icon in the top-right corner and select View all Outlook settings. Go to Mail in the left sidebar, then click Forwarding. Scroll down to find From address or Send mail as. Click Add email address and enter the address you want to send from.
You'll need to confirm that you own the address. Outlook will send a confirmation email to that address — open it and click the confirmation link. Once confirmed, the address will appear in the From dropdown when you compose a new message.
What to do if your email provider requires an app password
Some email providers — including Gmail, Microsoft 365 accounts, and Yahoo — don't allow Outlook to connect using your regular password for security reasons. Instead, they require an app password, which is a separate, randomly generated password just for Outlook.
If Outlook rejects your password during setup, check your email provider's security settings. For Gmail, you'll need to turn on 2-Step Verification first, then generate an app password in your Google Account settings. For Microsoft 365, go to your account security page and create an app password there. For Yahoo, use the Generate app password option in your account security settings.
Once you have the app password, go back to Outlook and try adding the account again. Use the app password instead of your regular password. The account should connect successfully.
Troubleshooting: The "From" address doesn't appear
If you've added an account but the address doesn't show up in the From dropdown, first try closing and reopening Outlook completely. Sometimes the application needs a moment to recognize the new account.
If that doesn't work, go back to your account settings and confirm the account was added successfully. In Outlook on Windows, go to File > Account Settings > Account Settings and check that the address is listed. On Mac, go to Outlook > Preferences > Accounts. If the account is there but still not showing in the From dropdown, the account may not be fully synced yet — wait a few minutes and try again.
If the account isn't listed in settings at all, the setup may have failed. Try adding it again, making sure you're using the correct password or app password for that email provider.
Switching between "From" addresses when you compose
Once you've added multiple addresses, composing from a different one is straightforward. Click New Message to start writing. Look for the From field near the top of the compose window — it usually shows your primary address by default.
Click on the From field or the dropdown arrow next to it. A list of all your added addresses will appear. Select the one you want to send from. The message will be sent under that address when you click Send.
Outlook remembers which address you used last, so if you frequently send from a non-primary address, you won't have to change it every time.
Frequently Asked Questions
Can I add an email address I don't own?
No. You can only add addresses you own or have explicit permission to send from. If you try to add someone else's address without permission, the email provider will reject it during the verification step. Some organizations allow employees to send from shared mailboxes, but those require special setup through your IT department.
Will adding a "From" address create a new Outlook account?
No. Adding a "From" address in Outlook on Windows or Mac adds the account to your existing Outlook installation so you can send from it. You're not creating a separate Outlook profile or account. On Outlook on the web, you're adding an alias to your main account, not a separate account at all.
What's the difference between adding a "From" address and forwarding?
Forwarding sends mail received at one address to another address you check. Adding a "From" address lets you send new messages as if they came from that address in the first place. The recipient sees the address you chose in the "From" line, not your primary address.
Do I need to add the account if I only want to reply from a different address?
Yes. You need to add the account to Outlook before you can send or reply from it. Once it's added, the address will appear in the From dropdown for both new messages and replies.
Why does Outlook keep asking for my password after I add an account?
This usually means the password you entered was incorrect, or the email provider rejected it. Make sure you're using the correct password — if your provider requires an app password, use that instead of your regular password. If you're still having trouble, reset your email password through your provider's website and try adding the account again.