If you have permission to send email from an alternate email address or an email alias, you can configure this alternate "From:" address in Microsoft Outlook. This may be a shared mailbox that you have permission to, or a legacy format of your primary email account (such as firstname.lastname@olin.edu). If you attempt to send email from a "From:" address that you do not have permission to use, the message will not be delivered.
The steps to send messages "From:" an alternate or alias email address vary depending on your version of Microsoft Outlook.
New Outlook (Windows):
1. Click the New mail button to compose a new email message.

2. In the Outlook menu bar, click the Option tab, then select the Show From check box.

3. Click the From: drop-down to select an address that is already configured, or select Other email address... at the bottom of the drop-down to add a new email address.
Old Outlook (Windows):
1. Click New Email to compose a new email message.

2. In the Outlook menu bar, click the Options tab, and select From in the Show Fields group.

3. In the message window, click the From button to open the drop-down menu, and select Other Email Address... at the bottom. Type in the alternate email address, and click OK.
New Outlook (Mac):
1. Click the New Mail button to compose a new email message.
2. In the message window, click the down-arrow at the end of the From: line to open the drop-down menu. Select Other email address...
3. Type the email address that you wish to add. When it appears in the search window, click it, and press OK.
Old Outlook (Mac):
The From field will only display when there is more than one account configured in Outlook profiles. You cannot send from aliases in Old Outlook for Mac.
Web Outlook:
1. Click the New mail button to compose a new email message.

2. In the Outlook menu bar, click the Option tab, then select the Show From check box.

3. Click the From: drop-down to select an address that is already configured, or select Other email address... at the bottom of the drop-down to add a new email address.