How to Change the "From" Address in Outlook

When you send an email in Microsoft Outlook, the "From" field determines which email address or account appears as the sender. Whether you're managing multiple accounts, sending on behalf of a colleague, or switching between a personal and professional identity, knowing how to control this field can save you from misdirected emails and awkward follow-ups.

What the "From" Field Actually Controls

The From field isn't just cosmetic. It tells recipients who sent the message, determines where replies land, and in some configurations, affects how your email is authenticated by spam filters. When Outlook displays a single default account, that From address is set automatically — but Outlook supports changing it in several ways depending on your setup.

There are two distinct scenarios here:

• Switching between your own accounts — when you have multiple email accounts configured in Outlook
• Sending on behalf of another account — when you've been granted delegate or "Send As" permissions by someone else

These require different steps, and the options available depend on your version of Outlook and account type.

How to Show the "From" Field When Composing

By default, Outlook may hide the From field if you only have one account configured. To make it visible:

1. Open a new email (New Email or Reply/Forward)
2. In the message window, click the Options tab (desktop Outlook) or look for the From button in the toolbar
3. If From isn't visible, select Options → Show Fields → From to enable it

Once visible, the From field appears as a dropdown. Clicking it reveals the accounts and addresses available to you.

Changing From When You Have Multiple Accounts

If you've added more than one email account to Outlook — say, a work Microsoft 365 address and a personal Gmail — the From dropdown will list each one. Selecting a different address switches the sending identity for that message only. Your default account remains unchanged for future emails.

To change your default "From" account permanently:

• Go to File → Account Settings → Account Settings
• Under the Email tab, select the account you want as default
• Click Set as Default

This affects all new emails going forward, though you can still override it per message using the From dropdown.

Sending From a Delegate or Shared Mailbox 📬

In organizational Microsoft 365 or Exchange environments, you may have access to a shared mailbox or delegate permissions on a colleague's account. In this case, you can type that address directly into the From field — or select it from the dropdown if Outlook has already detected the access.

If the address isn't appearing:

• Confirm that the mailbox owner or administrator has granted you Send As or Send on Behalf permissions
• In some cases, you may need to add the shared mailbox manually under Account Settings
• After adding, close and reopen Outlook for the address to appear in the From dropdown

Send As means your name won't appear — the email looks exactly as if the mailbox owner sent it. Send on Behalf includes a "sent on behalf of" note visible to recipients. These are different permissions with different visibility outcomes.

Outlook on the Web (OWA) vs. Desktop App

The steps vary slightly between platforms:

Outlook on the web tends to be the most straightforward — the From dropdown is visible in the compose window by default when multiple accounts or mailboxes are available. Mobile versions of Outlook have the least flexibility here, generally locking you to whichever account is active.

Variables That Affect Your Options

Not every Outlook user has the same choices available. Several factors shape what you can and can't do with the From field:

• Account type — Microsoft 365, Exchange, IMAP, and POP3 accounts each have different capabilities. Exchange and Microsoft 365 accounts support shared mailboxes and delegate permissions; IMAP/POP3 do not
• IT admin policies — In corporate environments, administrators may restrict which From addresses are permitted to prevent spoofing or policy violations
• Outlook version — Older versions of Outlook (2016 and earlier) handle the From field slightly differently than Microsoft 365 subscription versions
• Number of configured accounts — The From dropdown only appears when Outlook detects more than one sending option available to you
• Permissions granted — For shared or delegate mailboxes, the address only appears if access has been formally granted at the server level ✉️

When the From Address Isn't Changing as Expected

A few common reasons the From field may not behave as expected:

• Replies default to the receiving account — Outlook often auto-selects the account that received the original message. You can override this manually in the From dropdown
• The dropdown shows but won't accept a typed address — This usually means the address hasn't been added as an account or you haven't been granted permissions
• Cached credentials — Sometimes Outlook holds onto authentication for a previous account. Restarting Outlook or clearing the credential cache can help

How Your Setup Shapes the Right Approach 🔧

The right path for changing From in Outlook depends heavily on what you're actually trying to do — swapping between personal accounts, managing a shared inbox, handling delegate responsibilities, or something else entirely. The version of Outlook you're running, whether your account is on Exchange or a third-party mail server, and what permissions have been configured all feed into which options are available and which steps apply.

Understanding the mechanics is the starting point. Where those mechanics meet your specific configuration is where the actual answer lives.