10 KB EML sample file
An EML file of exactly 10,240 bytes. It is a valid Email message file, generated for this site and checked with an independent parser.
Download
sample-eml-10kb.eml
10 KB10,240 bytes
Download 10 KB EMLDirect download. No sign-up and no waiting.
- Type
- message/rfc822
- SHA-256
a687cca0f4db759ac0dddc0d93cf27e64a4f852dd4cd4f01183f9325e69399ac- Direct URL
https://sampletestfiles.com/downloads/eml/sample-eml-10kb.eml
What is in this file
A single-part plain-text message with standard headers and 29 body paragraphs. Addresses use the reserved example.com and example.org domains. Lines of hyphens at the end bring the message to the exact size.
| Body paragraphs | 29 |
|---|---|
| Headers | From, To, Subject, Date, Message-ID, MIME-Version, Content-Type |
| Content type | text/plain; charset=us-ascii |
| Line endings | CRLF, wrapped at 72 characters |
How the file begins
The opening lines of sample-eml-10kb.eml, exactly as they appear in the file.
From: "SampleTestFiles Samples" <samples@example.com>
To: "Test Recipient" <recipient@example.org>
Subject: Sample email message (10 KB)
Date: Thu, 01 Jan 2026 09:00:00 +0000
Message-ID: <sample-10kb@example.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Hello,
If the last line of this file is missing, the transfer was cut short.
Use it to check that uploads, downloads and parsers behave the way you
expect. Progress bars, retry logic and timeouts all deserve a test withPreview
Shows the file contents.
Where 10 KB matters
A 10,240-byte file that still arrives in the first round trip of a new connection. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| TCP initial congestion window | About 14.6 KB (10 segments) | A 10 KB response fits in the first flight of packets; the 25 KB sample does not. |
| nginx and Apache request headers | 8 KB per header line by default | Data this large must go in the request body. |
| webpack asset modules | 8 KB by default | Assets over the threshold are emitted as files instead of data URIs. |
Use this file for
- Checking thumbnail and icon handling
- Testing help-desk and archiving software
- Testing email parsers and import features
Testing notes for EML
- Header values can be folded across lines and encoded with RFC 2047 encoded-words; parsers that read headers line by line get subjects wrong.
- An HTML body is untrusted HTML and needs sanitising before display.
Technical details
| File name | sample-eml-10kb.eml |
|---|---|
| Format | EML (Email message) |
| Extension | .eml |
| MIME type | message/rfc822 |
| Size | 10,240 bytes (10 KB) |
| Kind | Text |
| SHA-256 | a687cca0f4db759ac0dddc0d93cf27e64a4f852dd4cd4f01183f9325e69399ac |
| Created | 2026-10-10 |
| Validation | Exact size, signature bytes and structure checked when the file was generated |
| Preview | Available on this page |
| Source | Generated for this site; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Email & Calendar |
Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Download from the command line and verify
Fetch the file with curl, then compare its checksum with the SHA-256 value above.
curl -o sample-eml-10kb.eml 'https://sampletestfiles.com/downloads/eml/sample-eml-10kb.eml'
sha256sum sample-eml-10kb.eml # Linux
shasum -a 256 sample-eml-10kb.eml # macOSOn Windows, run Get-FileHash sample-eml-10kb.eml -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.
Related files
Questions about this file
- Is this file exactly 10 KB?
- Yes. It is 10,240 bytes, which is 10 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 10 KB EML file?
- A single-part plain-text message with standard headers and 29 body paragraphs. Addresses use the reserved example.com and example.org domains. Lines of hyphens at the end bring the message to the exact size.
- Are the email addresses real?
- No. They use example.com and example.org, which are reserved for documentation and cannot receive mail.