Office 365 allows you to create a signature for your email messages. Your signature can be added automatically to all outgoing messages, or you can choose to add your email signature only to specific messages.
If you use Outlook across multiple platforms, such as Outlook on the Web, Outlook for Windows, or Outlook for MAC, then you will need to create a signature for each. For information about how to create and use email signatures in Outlook, see Create and add an email message signature to find out how to:
Note: You will need to sign into Microsoft 365 (portal.office.com) with your CNetID and password.
If you've created an email signature in Outlook for the web on your desktop or laptop, you'll see it under the Options menu on your mobile device. You can use that signature, or you can create a mobile signature. If you create a mobile signature, it will be used in place of your default signature when you send a message from a mobile device.