The structure and rendering of multipart emails

When marked as multipart/alternative, an email message can contain multiple versions of the same content which allows the email client to render the message in the most appropriate format for the user's device. In most cases, two versions are included: the plaintext version (text/plain) and HTML version (text/html). Other content types such as AMP (text/x-amp-html) are often used in conjunction with the plaintext and HTML versions.

See also

Pantothenic Acid Molecule Poster, 2D Structure, English-Labeled
$19.99

A poster featuring the 2D structure of the pantothenic acid molecule.

Aromanian Alphabet Poster, English-Labeled
$17.99

The Aromanian alphabet chart.

Big Chemical Structures
$29.99

A collection of elaborate, large-format chemical structure depictions. Discover the fine details of chemical structures in their own right.

Big Function Plots
$29.99

A collection of 2D plots depicting mathematical functions ranging from simple polynomials to inverse trigonometric relationships.

Quantum Gates Poster, English-Labeled
$19.99

A poster featuring the common quantum gates.

cid URLs for email developers

What are cid URLs and how are they interpreted by email clients?

MAIL FROM and RCPT TO vs. the To and From headers

The difference between the email envelope and message headers when it comes to senders and recipients.

Email Parser

Parse, inspect, and debug emails online.

MJML Editor

A simple online editor for MJML (Mailjet Markup Language).

Receiving email with Node.js

How to receive email in Node.js?

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