eml1.5 KB

EML — To: Header Folded Across 24 Recipients

A To: header listing 24 addresses, folded after every comma. Address-list parsers that unfold and split in the wrong order produce addresses with a leading space or lose the display name of every recipient after the first.

Email parsing Conversion testing

Preview — first 35 lineseml

From: Meridian Ops <ops@meridiansupply.example>
To: Ada Fernsby <ada@meridiansupply.example>,
 Ben Okafor <ben@meridiansupply.example>,
 Chiara Rossi <chiara@meridiansupply.example>,
 Dev Patel <dev@meridiansupply.example>,
 Elena Marsh <elena@meridiansupply.example>,
 Farid Haddad <farid@meridiansupply.example>,
 Grace Lim <grace@meridiansupply.example>,
 Hugo Brandt <hugo@meridiansupply.example>,
 Ines Duarte <ines@meridiansupply.example>,
 Jonas Weber <jonas@meridiansupply.example>,
 Kaya Nurmi <kaya@meridiansupply.example>,
 Liam Doyle <liam@meridiansupply.example>,
 Mira Kaur <mira@meridiansupply.example>,
 Noor Aziz <noor@meridiansupply.example>,
 Otto Lindqvist <otto@meridiansupply.example>,
 Priya Raman <priya@meridiansupply.example>,
 Quinn Adeyemi <quinn@meridiansupply.example>,
 Rosa Mendes <rosa@meridiansupply.example>,
 Sven Halvorsen <sven@meridiansupply.example>,
 Tara Nilsen <tara@meridiansupply.example>,
 Uma Sethi <uma@meridiansupply.example>,
 Viktor Novak <viktor@meridiansupply.example>,
 Wren Castillo <wren@meridiansupply.example>,
 Yusuf Demir <yusuf@meridiansupply.example>
Subject: Week 7 supply notice (24 recipients)
Date: Sat, 14 Feb 2026 08:00:00 -0800
Message-ID: <p7-fold-recipients@meridiansupply.example>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit

The header block is the fixture here; the body is deliberately short.
Every folded header's unfolded value is recorded in this file's specs.

Specifications

Wave: p7
Seed: 20260807
Recipients: 24
Continuation Lines: 23
Fold Point: after each comma
Continuation Char: SP
Line Endings: CRLF (RFC 5322)

Testing contract

Expected to pass

Scenario: Unfold and split a 24-address To: header that wraps after each comma.
Expected result: Exactly 24 addresses parse, each with its display name intact and no leading or trailing whitespace in the address part.

What is a .eml file?

An EML file is a single email message stored in the RFC 822 / MIME format — plain-text headers (From, To, Subject, Date, Message-ID) followed by the body, which may be plain text, HTML, or a multipart structure with alternative bodies and file attachments encoded in base64.

How to use this file

Use an example EML to test email header parsing, MIME decoding, HTML-part handling, attachment extraction, and EML-to-other-format conversion.

How to use this file for testing

“EML — To: Header Folded Across 24 Recipients” is a deterministic Novus Examples fixture for Email parsing, Conversion testing. Standards-compliant RFC 822 messages — plain, multipart text+HTML, and with an attachment — plus an MBOX mailbox, for testing header parsing, MIME decoding, attachment extraction, and mailbox splitting.

Documented properties for this file: seed 20260807 · CRLF (RFC 5322). Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.

Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.

Email fixtures use fixed dates, message IDs, and MIME boundaries so runs are reproducible, and every address is fictional. Test header parsing, MIME decoding, attachment extraction, and EML/MBOX conversion against the documented structure.

Code examples

from email import policy
from email.parser import BytesParser

msg = BytesParser(policy=policy.default).parse(open("folding-many-recipients.eml", "rb"))
print(msg["subject"], msg["from"])