If you want to convert your single or multiple EML files to Yahoo, Aryson EML Converter Tool is the best conversion tool I’ve ever used. It converts the EML file to MLX, MBOX, HTML, PDF, MSG, PST, and MHT. If you need to migrate these files to other email clients, this tool can help you. It allows you to transfer your emails to Gmail, Yahoo, Outlook, IMAP, Thunderbird, and Opera Mail. It offers a demo version, that provides conversion of the first 25 emails for free. The software is available for Windows, Mac, and Linux users.