mbox2.4 KB

MBOX Mailbox — six-message thread

A larger mbox mailbox with a six-message back-and-forth thread — for testing mailbox splitting, thread reconstruction, and pagination over more than a couple of messages.

Email parsing Conversion testing

Preview — first 50 linesmbox

From maya@brightside.example Mon Jan 12 09:00:00 2026
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
From: Maya Chen <maya@brightside.example>
To: Sam Rivera <sam@meridiansupply.example>
Subject: Standing order for Q1
Date: Mon, 12 Jan 2026 09:00:00 -0800
Message-ID: <q1-1@brightside.example>

SGkgU2FtLAoKQ2FuIHdlIHNldCB1cCBhIHN0YW5kaW5nIG1vbnRobHkgb3JkZXIgZm9yIFExPwoK
TWF5YQo=

From sam@meridiansupply.example Mon Jan 12 09:00:00 2026
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
From: Sam Rivera <sam@meridiansupply.example>
To: Maya Chen <maya@brightside.example>
Subject: Re: Standing order for Q1
Date: Mon, 12 Jan 2026 10:30:00 -0800
Message-ID: <q1-2@brightside.example>

SGkgTWF5YSwKClN1cmUg4oCUIHNhbWUgaXRlbXMgYXMgRGVjZW1iZXI/CgpTYW0K

From maya@brightside.example Mon Jan 12 09:00:00 2026
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
From: Maya Chen <maya@brightside.example>
To: Sam Rivera <sam@meridiansupply.example>
Subject: Re: Standing order for Q1
Date: Mon, 12 Jan 2026 11:15:00 -0800
Message-ID: <q1-3@brightside.example>

WWVzLCBwbHVzIGFuIGV4dHJhIGNhc2Ugb2YgbmFwa2lucy4KTWF5YQo=

From sam@meridiansupply.example Mon Jan 12 09:00:00 2026
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
From: Sam Rivera <sam@meridiansupply.example>
To: Maya Chen <maya@brightside.example>
Subject: Re: Standing order for Q1
Date: Mon, 12 Jan 2026 13:00:00 -0800
Message-ID: <q1-4@brightside.example>

R290IGl0LiBJJ2xsIHNlbmQgdGhlIHF1b3RlIHRoaXMgYWZ0ZXJub29uLgpTYW0K

From maya@brightside.example Mon Jan 12 09:00:00 2026

… 74 lines total — download for the full file.

Specifications

Format: mbox (mboxo)
Messages: 6
Separators: 'From ' lines
Escaping: >From

What is a .mbox file?

An MBOX file is a mailbox that stores many email messages concatenated into one plain-text file, each message preceded by a 'From ' separator line. It is the classic Unix mailbox format used by many mail clients for export and archival.

How to use this file

Use an example MBOX to test mailbox splitting, message boundary detection, thread reconstruction, and import into a mail client or parser.

Code examples

import mailbox

for msg in mailbox.mbox("q1-thread.mbox"):
    print(msg["subject"])

Generated by generation/email_extra.py. Free for any use, no attribution required — license.

Specifications

What is a .mbox file?

How to use this file

Code examples

Related files