The Outlook app on cell phones has a unified inbox which will show you email from multiple accounts. If you have older email already downloaded to your phone, then you will be able to reply to it after setting up the new @legaleaseplan.com box.
Adding the new email to Outlook for mobile app
1. Click the home icon on the top left corner, then click the gear icon to access the settings.
2. Click Add Mail Account
3. Click Add Email Account
4. Enter in your_name@legaleaseplan.com
5. If you get re-directed to a Google sign-in page, click Done, the click the Set Up Account Manually button.
6. Choose Office 365
7. Enter in your_name@legaleaseplan.com then click Next
8. Enter in your password (same password you use for Teams, SharePoint, and Office).
Replying to an old email with the new address
1. When you click into the Reply window at the bottom of the message, click the expand arrows
2. On the top of the screen, click the down arrow to expand the available email addresses.
3. Then select the new @legaleaseplan.com email address