Check out the Identities feature. It lets you save certain aspects of your messages, including signatures, as "Identities". Then, when you create a message or a response, you can choose from a drop-down list of the ones you have created. Here's an article about them: https://support.mozilla.org/en-US/kb/using-identities And here's an article about how to create and use Signatures. https://support.mozilla.org/en-US/kb/signatures By the way, any donation you might like to make would be appreciated and would help the project, but it's not expected. Thunderbird is free, open-source software, and there's no money needed to download, install, or use it.