If you are looking for automated and free EML viewer to open email files easily, a then I recommend using an good option that is SysTools EML Viewer. It allows you to open and read EML files without installing Outlook, Thunderbird, or any other email application.
This dedicated tool supports bulk EML file viewing and lets you preview emails along with their attachments. It also provides multiple viewing modes such as HTML, MIME, Message Header, Hex, and RTF, which can be useful if you need to examine email details more closely. One can use it’s demo version for free.
