Converting MBOX emails to PDF can be useful when you need to archive conversations, share email records, or access messages without an email client. The best method depends on the size of your mailbox and whether you need to preserve email formatting and attachments.
If your email application supports printing messages to PDF, you can use that option for a small number of emails. However, this approach may take considerable time when you have many messages because you might need to process them individually.

For larger mailboxes, an MBOX conversion utility may provide a more convenient workflow. For example, the MacSonik MBOX to PDF Converter is an option to explore if you need to convert MBOX files into PDF format. Before choosing any tool, check whether it supports batch conversion, email preview, folder selection, and the handling of attachments required for your work.