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What is MBOX?

MBOX is a common plain-text file format for storing collections of email messages in a single file. Each message is appended one after another, typically separated by a line that starts with “From ” (called the “From separator”).

Key characteristics

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  • Format: Plain text; messages concatenated sequentially.
  • Separators: Messages usually begin with a line starting with “From ” followed by the sender and timestamp.
  • Encodings: Message bodies and headers may include MIME, base64, quoted-printable, and various charset encodings.
  • Extensions: Common file extensions include .mbox, .mbx, .mbs; some mail clients use no extension.
  • Variants: Several mbox variants exist (mboxo, mboxrd, mboxcl, mboxcl2) that differ in how they escape “From ” lines appearing in message bodies.

Where it’s used

  • Desktop email clients: Thunderbird, Apple Mail (can import/export), Evolution.
  • Mail migration and backups.
  • Forensic and archival tools.

Advantages

  • Simple, human-readable structure.
  • Widely supported by many tools and libraries.
  • Easy to append new messages.

Limitations

  • Single-file storage can grow large and become inefficient for random-access operations.
  • No native indexing; searching requires scanning or building separate indexes.
  • Variants and escaping differences can cause parsing issues if the wrong mbox flavor is assumed.
  • Attachments and non-ASCII content require correct MIME and encoding handling.

Common operations

  1. Parsing and extracting individual messages (using libraries in Python, Perl, etc.).
  2. Converting to other formats: Maildir, EML, PST.
  3. Searching within messages (requires building an index or scanning).
  4. Splitting large mbox files into smaller files by date, sender, or size.

Quick example (conceptual)

  • To extract messages: read file, split on valid “From ” separators considering escaping rules, decode headers and MIME parts, save each message as .eml or import into a mail client.

If you want, I can provide: a short Python script to parse mbox, instructions to convert mbox to Maildir, or tools that handle mbox files—tell me which.

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