eml567 B

EML — Headers Folded With HTAB Continuations

Two headers folded with horizontal tabs instead of spaces, which RFC 5322 permits exactly as it permits spaces. Parsers that test only for a leading space treat the continuation as a brand-new header and lose the second half of the Subject.

Email parsing Conversion testing

Preview — first 17 lineseml

From: Meridian Ops <ops@meridiansupply.example>
To: Maya Chen <maya@brightside.example>
Subject: Delivery window
	for week 7
	has moved to 11:00
Date: Sat, 14 Feb 2026 08:15:00 -0800
Message-ID: <p7-fold-htab@meridiansupply.example>
X-Novus-P7-Comment: Meridian Supply Co.
	Portland warehouse
	SAMPLE routing note
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
Continuation Char: HTAB (0x09)
Folded Headers: Subject, X-Novus-P7-Comment
Unfolded Subject: Delivery window for week 7 has moved to 11:00
Line Endings: CRLF (RFC 5322)

Testing contract

Expected to pass

Scenario: Unfold headers whose continuation lines begin with HTAB rather than SP.
Expected result: Subject unfolds to "Delivery window for week 7 has moved to 11:00" and no phantom header named after a continuation fragment appears.

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 — Headers Folded With HTAB Continuations” 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-htab-continuation.eml", "rb"))
print(msg["subject"], msg["from"])