How to Add a "From" Field in Outlook (And Send Email From Multiple Addresses)

If you've ever needed to send an email as a different address — a shared mailbox, an alias, or a delegated account — you've probably noticed that Outlook doesn't always show a "From" field by default. It's there, but hidden until you enable it or add the right account. Here's exactly how it works, what controls it, and what affects whether it behaves the way you expect.

Why the "From" Field Isn't Always Visible

Outlook hides the From selector when you only have one email account configured. There's no need to choose a sender if there's only one option. The moment you add a second account, receive delegate access to another mailbox, or configure an alias, Outlook surfaces the From field automatically in the compose window.

This applies across Outlook for Windows, Outlook for Mac, Outlook on the web (OWA), and the New Outlook experience — though the exact steps differ slightly between each.

How to Enable and Use the From Field in Outlook

Outlook for Windows (Classic)

1. Open a new email (compose window).
2. Click the Options tab in the ribbon.
3. Select From — this toggles the From field on in the compose window.
4. Once visible, click the From dropdown to choose which address to send from.

If you don't see additional addresses in that dropdown, it's because Outlook only shows accounts that are already added or delegated. You can't type an arbitrary address here without backend support from your mail server.

Outlook for Mac

1. Open a new message.
2. If the From field isn't visible, go to View > From Field in the menu bar — or simply add a second account.
3. Use the From dropdown in the compose window to switch senders.

Outlook on the Web (OWA)

1. Click New message.
2. Near the top of the compose pane, look for the From line — it may already appear if you have multiple accounts or mailboxes.
3. If it's not there, click the three-dot menu (…) inside the compose window and select Show From.
4. Click the From address to toggle between available options.

New Outlook (Windows 11 / Microsoft 365)

The New Outlook experience follows a similar pattern to OWA. The From field appears automatically when multiple accounts are connected. Use the From dropdown to switch between them when composing.

What You Can Actually Send From 📬

Not all addresses are equal when it comes to Outlook's From field. What appears in that dropdown depends on your configuration:

The key distinction: aliases tied to your existing mailbox vs. separate accounts with their own credentials. Aliases let you send as a different address without logging into a separate account. Separate accounts require their own credentials and sync independently.

Adding a Second Account to Unlock the From Field

If you want the From field to appear and offer choices, the most direct route is adding another account:

1. Go to File > Add Account (classic Outlook for Windows).
2. Enter the email address and follow the prompts.
3. Once added, the From selector becomes active in every new compose window.

For shared or delegated mailboxes, the process involves opening that mailbox through your existing account rather than adding fresh credentials. In Outlook for Windows, go to File > Account Settings > Account Settings, select your account, click More Settings > Advanced, and add the shared mailbox under Open these additional mailboxes.

Variables That Change How This Works 🔧

This is where setups diverge significantly. What works straightforwardly for one person may require admin intervention for another:

• Account type matters. Microsoft 365 and Exchange accounts support aliases and shared mailboxes natively. IMAP/POP accounts (like personal Gmail or older setups) have more limited From field behavior.
• Organizational policies. If your Outlook is managed by a company IT department, they may restrict which addresses you can send from, or require them to be provisioned centrally.
• Send As vs. Send on Behalf. These are two different permission levels for shared or delegated mailboxes. Send As makes the email look like it came directly from that address. Send on Behalf shows both the sender and the original mailbox. Which one you have — or can have — depends on what's been granted to you.
• Version differences. Classic Outlook for Windows, New Outlook, Outlook for Mac, and OWA all handle the From field slightly differently in terms of where the setting lives and how the dropdown behaves.
• SMTP authentication. For non-Exchange accounts, whether your mail provider allows you to send from an alias depends on their SMTP settings — not Outlook itself.

When the From Field Behaves Unexpectedly

A few common friction points worth knowing:

• You type an address manually but it bounces or sends from the wrong account. Outlook's From field is a selector, not a free-text field that overrides your mail server. The address must be authorized.
• The From dropdown shows the address, but replies come back to the wrong inbox. This can happen with aliases if the Reply-To header isn't configured correctly — usually a server-side setting.
• The From field disappears after restarting. In classic Outlook, the From visibility toggle isn't always persistent. You may need to re-enable it via Options each session, or it may stay on if multiple accounts remain connected.

How Your Setup Determines What's Possible

The mechanics of the From field are consistent — Outlook checks which addresses your account configuration authorizes, then surfaces them as options. But whether those options include just your primary address, a handful of aliases, or a full list of shared team mailboxes depends entirely on how your accounts are set up, what permissions have been granted, and which version of Outlook you're working in.

Someone using a personal Microsoft account on Outlook for Mac has a very different starting point than someone in a large organization using Outlook on a managed Windows device connected to an Exchange server. The steps are technically the same; the outcomes aren't.