Office 365 (Thunderbird) - Create and add an email message signature

Best Effort Support Only

This document contains instructions on using a non-Microsoft email client, such as Apple Mail or Thunderbird. Microsoft does not recommend these clients for use with Office 365, and there are often significant limitations in client functionality as a result.

Because of this, the DoIT Help Desk is only able to offer best effort support for these clients, and certain issues may require the use of a Microsoft client in order to be resolved. For more information on Office 365 client support, please see: Office 365 - Which clients/protocols will be supported?.

This document explains how to create a signature in Thunderbird. If you use Thunderbird and the Outlook Web App, you have to create your signature in both. Office 365 (Outlook on the web | Outlook for Windows/MacOS) - Add an email signature

Create a signature

  1. Go to Account Settings by highlighting your email address and clicking View settings for this Account under Accounts, or by right-clicking your email address and selecting Settings.



  2. In the account settings window, highlight your email address.


  3. Under Account Settings, customize a signature.
    • Check the Use HTML box to allow the use of HTML in your signature.
    • Check the Attach the signature from a file instead box to use a signature stored in a file.


  4. Click OK.