Thunderbird is a popular email client and it comes with its own built-in signature feature. You can create a signature by selecting the Signature tab in the main Thunderbird window, and then clicking on the Create Signature button. The process of creating a signature is simple. You first need to provide a name for your signature, and then you need to provide some basic information about your email address. You can also provide some additional information about your email such as your company name or your contact information. After you have provided all of the necessary information, you can click on the Create Signature button. The process of creating a signature will take some time, so be patient! Once it has finished, you will see a message telling you that your signature has been created. You can use your signature to send emails withThunderbird. If you want to send an email with Thunderbird without having a signature, you can use the Inbox feature instead.


First open Notepad and create your desired signature.

Save this text file in a familiar location on the hard drive.  I put mine in Documents.  Next open Thunderbird and click on Tools Account Settings.

Keeping the default dialog box open, in Default Identity check Attach this signature:  Then browse to the location where you kept the signature text file and click OK.

Now the signature will show up any time you create a new email message.

There are also several cool Add-ons for Thunderbird for further manipulating your email signature.