Excel2Mail (previously known as - Paste Excel Table into Mail Compose) is a Thunderbird add-on designed to boost email productivity by enabling users to paste Excel spreadsheet tables directly into the compose window as formatted HTML tables. With simple activation via a toolbar button or customizable keyboard shortcut, it converts clipboard tab-separated data into neat, styled tables at the cursor position. This eliminates manual formatting, streamlines workflow, and enhances the professionalism of emails involving tabular data. The extension prioritizes ease of use, minimal permissions, and security by escaping HTML content to prevent injection. Excel2Mail is ideal for professionals who frequently share spreadsheet data via email and seek a smooth, integrated solution within Thunderbird.