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MBOX viewer · Email Archive Rescue

MBOX Viewer Online: open and read MBOX and EML files

Add an MBOX or EML file, or a ZIP of them. You get a browsable HTML index of the messages that opens in any browser, every message as an EML file, a message list as CSV and the attachments in their own folder.

Open an MBOX file See an example result

Free: 3 jobs a day, files up to 10 MB, no account · Pro: up to 25 files and 128 MB per job · Plans

Accepts .mbox, .mbx (mbox format only), .eml and .zip. Not PST or MSG.

  • Remote images and links stay blocked
  • Source files deleted after processing
  • Failed jobs are never counted
WHAT YOU GETSample data
  • index.htmlBrowsable list of the readable messages. Opens in your browser, no mail program needed.
  • EML exportEach message as its own .eml file.
  • Message CSVOne row per message, ready for a spreadsheet.
  • AttachmentsExtracted into a separate quarantine folder, each with a SHA-256 hash.
  • WarningsDamaged or skipped messages listed by number.
Messages
1,842
Attachments
38
Damaged records
3
Figures from the prepared example archive, which uses fictional data.

HOW IT WORKS

From an MBOX file to emails you can read.

  1. 01
    Add the archive

    Choose an .mbox, .eml or .zip file. Formats and limits are checked before anything runs.

  2. 02
    Confirm the job

    You see the file names and settings first. Nothing is counted until you confirm.

  3. 03
    Download and read

    Open index.html from the package to browse the messages. The encrypted result is kept for 24 hours.

Prepared result preview

What an opened archive looks like

This prepared example uses fictional data and the same structure as a real export: readable messages, attachments kept apart, and a list of anything that could not be read cleanly.

✓
Nothing is uploadedPublic demo only

Email recovery

1,842 messages readable, three with warnings

Remote content stays blocked; non-mbox MBX databases, PST and MSG input are not accepted or claimed as recovered.

Actual prepared coverage: EML and RFC 4155-style mbox · non-mbox MBX/PST/MSG blocked

  • WarningMalformed MIME boundarymessage 000441 · readable body retained with parse warning
  • QuarantineActive attachment isolatedinvoice.html · remote references removed from the index
  • EvidenceMessage and attachment hashesEvery recovered item has a source and output SHA-256
Messages
1,842
Attachments
38
Damaged records
3
Show the verified package

Browsable HTML index, EML export, quarantined attachments, message CSV and hash manifest

Engine email-archive-rescue-v2 · rules rfc5322-mime-mbox-span-provenance-2026-08-31

For damaged archives and record keeping

Recovery and evidence details

Besides reading mail, the same job rescues what it can from broken archives. These details matter for migrations, legal holds and records work.

  1. Add the source.Accepted inputs are MBOX, MBX, EML, ZIP. The visible limit is 25 files · 128 MB total.
  2. Confirm the job.Every assigned source number, selected filename and setting stays visible before the confirmed SHA-256 input hash is accepted. Product-specific mappings remain explicit settings rather than guessed roles.
  3. Process in isolation.A one-job networkless sandbox receives only this job and cannot access accounts, queues, encryption keys or other customer storage.
  4. Review exact findings.Inspect EML and RFC 4155-style MBOX bundles (including .mbx files only when they use that mbox envelope), preserve hashes and export an offline recovery package.
  5. Download the evidence.Browsable HTML index, EML export, quarantined attachments, message CSV and hash manifest Every output hash is covered by the coordinator-created manifest.

What this product does not claim

Remote content stays blocked; non-mbox MBX databases, PST and MSG input are not accepted or claimed as recovered.

Formats, limits & file handling
Works with
MBOX, MBX, EML, ZIP
Limit
25 files · 128 MB total
You receive
Browsable HTML index, EML export, quarantined attachments, message CSV and hash manifest
File handling
Draft 2 hours · encrypted result 24 hours

Turn an open-format mail archive into browsable messages, quarantined attachments and a corruption register.

Clear answers

MBOX viewer FAQ

Can I read the emails without installing a mail program?

Yes. The package contains an index.html file that lists the readable messages and opens in any web browser. Each message is also saved as an .eml file, which most mail programs can open.

Which archive formats are accepted?

EML files and RFC 4155 style MBOX bundles, including .mbx files when they use that same mbox envelope. Up to 25 files and 128 MB in total, ZIP containers included.

Can it open a PST or MSG file?

No. Outlook PST stores, MSG items and proprietary MBX databases that are not mbox envelopes are rejected at intake rather than partly recovered.

What happens to attachments?

They are extracted into a quarantine folder and listed with a SHA-256 hash. Active content such as an HTML attachment keeps its remote references stripped in the browsable index.

What does a damaged message look like in the report?

A message with a broken MIME boundary keeps whatever body could be read and carries a parse warning with its message number, so you can see what was salvaged.

Does a completed run mean nothing was lost?

No. Recovery is bounded by what the file still contains. The register lists every warning and every skipped item, and no claim is made about messages the archive never held.

Available now

Open your MBOX file and read the messages.

Or inspect the fictional example first. Your own files run here without an account: 3 free jobs a day, or up to 200 a day with Pro.

Open an MBOX fileSee the exampleFind another tool