I suggest you use the MacSonik EML Viewer Pro. It can convert EML files into multiple formats such as MBOX, PST, PDF, JPG, EMLX, MSG, DOC, and many more. The software allows you to access, view, and read single or multiple EML files without any hassle or complication. You can also add multiple EML files and preview their content, including subjects, attachments, and other information.