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EML — Thread Depth 4 (Large Headers)

Threaded SAMPLE reply at depth 4 with a long References chain and bulky X-headers.

File: EML · Threading
Use case: Email parsingConversion testing· Conversion set

EML — Thread Depth 5 (Large Headers)

Threaded SAMPLE reply at depth 5 with a long References chain and bulky X-headers.

File: EML · Threading
Use case: Email parsingConversion testing· Conversion set

EML — Thread Depth 6 (Large Headers)

Threaded SAMPLE reply at depth 6 with a long References chain and bulky X-headers.

File: EML · Threading
Use case: Email parsingConversion testing· Conversion set

EML — Thread Depth 7 (Large Headers)

Threaded SAMPLE reply at depth 7 with a long References chain and bulky X-headers.

File: EML · Threading
Use case: Email parsingConversion testing· Conversion set

EML — Thread Depth 8 (Large Headers)

Threaded SAMPLE reply at depth 8 with a long References chain and bulky X-headers.

File: EML · Threading
Use case: Email parsingConversion testing· Conversion set

EML — Threaded References Headers

A reply carrying In-Reply-To and References headers — for email thread reconstructors.

File: EML · Headers
Use case: Email parsingConversion testing

EML — Three Authentication-Results Headers From Three Hops

A mailing-list post carrying three Authentication-Results headers stamped by three different hosts, where DKIM passed upstream and failed at the final hop after the list rewrote the message. Only the topmost header, from the receiving host, may be trusted.

File: EML · Authentication
Use case: Email parsingMetadata testing· Conversion set

EML — Three-Level Nesting (mixed > related > alternative)

The canonical rich-mail shape written out in full: a mixed container holding a related container holding an alternative pair, plus a CSV attachment at the outer level. A tree walker has to reach depth three to find the HTML body and still report exactly one attachment.

File: EML · Mime
Use case: Email parsingConversion testing· Conversion set

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.

File: EML · Headers
Use case: Email parsingConversion testing· Conversion set

EML — Two DKIM-Signature Headers, One With an l= Tag

Two DKIM-Signature headers for the same message — the RSA/Ed25519 double-signing used during algorithm migrations — with an l= body-length tag on the first. l= means only the first 120 octets are covered, so anything appended afterwards still verifies; both values are SAMPLE placeholders.

File: EML · Authentication
Use case: Email parsingMetadata testing· Conversion set

EML — Two-Instance ARC Chain (SAMPLE Seals)

A forwarded message carrying a two-instance ARC chain — Seal, Message-Signature and Authentication-Results at i=1 and i=2 — where DKIM broke in transit but ARC records that it passed upstream. Every seal is a visible SAMPLE placeholder, not real cryptography.

File: EML · Authentication
Use case: Email parsingMetadata testing· Conversion set

EML — UTF-8 Encoded Subject

An email whose Subject uses RFC 2047 UTF-8 encoded-words (café / crème) — for header decoding tests.

File: EML · Headers
Use case: Email parsingEncoding detection+1

EML — UTF-8 Filename Attachment

An attachment whose filename uses RFC 2231 UTF-8 encoding (résumé) — for MIME filename decoders.

File: EML · Mime
Use case: Email parsingEncoding detection+1

EML Delivery — Bounce Mailbox Full

SAMPLE delivery/DSN-related .eml (bounce-mailbox-full) for mailbox parsers.

File: EML · Dsn
Use case: Email parsing· Conversion set

EML Delivery — Calendar Invite Note

SAMPLE delivery/DSN-related .eml (calendar-invite-note) for mailbox parsers.

File: EML · Delivery
Use case: Email parsing· Conversion set

EML Delivery — Dsn Delayed Plain

SAMPLE delivery/DSN-related .eml (dsn-delayed-plain) for mailbox parsers.

File: EML · Dsn
Use case: Email parsing· Conversion set

EML Delivery — Dsn Failed Plain

SAMPLE delivery/DSN-related .eml (dsn-failed-plain) for mailbox parsers.

File: EML · Dsn
Use case: Email parsing· Conversion set

EML Delivery — Out Of Office

SAMPLE delivery/DSN-related .eml (out-of-office) for mailbox parsers.

File: EML · Delivery
Use case: Email parsing· Conversion set

EML Delivery — Receipt Mdn

SAMPLE delivery/DSN-related .eml (receipt-mdn) for mailbox parsers.

File: EML · Delivery
Use case: Email parsing· Conversion set

EML Header — Auto Submitted

SAMPLE .eml focusing on auto submitted header behaviour.

File: EML · Headers
Use case: Email parsing· Conversion set

EML Header — Content Language

SAMPLE .eml focusing on content language header behaviour.

File: EML · Headers
Use case: Email parsing· Conversion set

EML Header — Dkim Signature Shape

SAMPLE .eml focusing on dkim signature shape header behaviour.

File: EML · Headers
Use case: Email parsing· Conversion set

EML Header — List Unsubscribe

SAMPLE .eml focusing on list unsubscribe header behaviour.

File: EML · Headers
Use case: Email parsing· Conversion set

EML Header — Priority Urgent

SAMPLE .eml focusing on priority urgent header behaviour.

File: EML · Headers
Use case: Email parsing· Conversion set