Reading an MBOX file without an email client is possible using free methods. You can open the MBOX file with a simple text editor like Notepad or Notepad++ to view raw email data, including headers and message content. However, this method is not user-friendly for large files.
A better free option is to use MailsDaddy
Free MBOX viewer tool that allows you to upload and read emails in a structured format. This tools display messages with proper formatting, attachments, and metadata. Always ensure your data is secure when using online platforms. You can also upgrade the solution later to move mailbox from MBOX to PST and others.