Apps similar to Mail Viewer include Mbox Viewer Pro, which has a free version. Other options are MailViewer. Between them they cover Mac, Windows and Linux.
Mbox Viewer Pro opens MBOX and EML files natively on your Mac. Fast, private, and account-free. Perfect for reading, searching and archiving email exports from Apple Mail, Thunderbird, Google Takeout, Gmail, Outlook and more.
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MailViewer is a desktop application built with GTK4/libadwaita and Rust that allows users to read and decode .eml files (email files). It provides a graphical interface for easy navigation and rendering of email content, including attachments, HTML, and plain text.
