What is a .MBOX file?
MBOX stores many emails in one file - the classic Unix mailbox format.
- Did you know
- The mbox mailbox format goes back to early Unix mail in the 1970s.
- In an mbox file every message begins with a line starting “From ”, which is how readers tell one message from the next.
- Several incompatible mbox variants exist - mboxo, mboxrd, mboxcl and mboxcl2 - differing in how they escape that “From ” line.
- What Analyser shows you
- Open email messages and mailboxes in the browser: single messages (EML, Apple Mail EMLX) and whole mailboxes (MBOX). Reads From/To/Subject/Date, counts the Received relay hops, surfaces SPF/DKIM/DMARC authentication results, lists attachments, and renders the message body (HTML sanitised with scripts and remote content removed, or plain text).
- Open a .MBOX file
- Drag a .MBOX file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
- Related formats
- .EML · .EMLX. See all supported file types.