Structure and rendering of AMP emails
Important: this documentation is not applicable to your currently selected format websites!
Email is structured as a MIME tree. This MIME tree contains the message body and any attachments to the email.
To embed AMP within an email, add a new MIME part with a content type of text/x-amp-html as a descendant of multipart/alternative. It should live alongside the existing text/html or text/plain parts. This ensures that the email message works on all clients.
For more information about the multipart/alternative subtype, refer to RFC 1521, section 7.2.3.
Additional information
The text/x-amp-html part must be nested under a multipart/alternative node. An email cannot have more than one text/x-amp-html part inside a multipart/alternative node.
The multipart/alternative must contain at least one non-AMP (text/plain or text/html) node in addition to the text/x-amp-html node. This will be displayed to users whose email clients don't support AMP or who opted out via their email provider's settings.
text/x-amp-html MIME part before the text/html MIME part. Replying/forwarding semantics
The email client strips out the text/x-amp-html part of the MIME tree when a user replies to or forwards an AMP email message.
Expiry
The email client may stop displaying the AMP part of an email after a set period of time, e.g. 30 days. In this case, emails will display the text/html or text/plain part.
Example
From: Person A <persona@example.com> To: Person B <personb@example.com> Subject: An AMP email! Content-Type: multipart/alternative; boundary="001a114634ac3555ae05525685ae" --001a114634ac3555ae05525685ae Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Hello World in plain text! --001a114634ac3555ae05525685ae Content-Type: text/x-amp-html; charset="UTF-8" <!doctype html> <html ⚡4email> <head> <meta charset="utf-8"> <style amp4email-boilerplate>body{visibility:hidden}</style> <script async src="https://cdn.ampproject.org/v0.js"></script> </head> <body> Hello World in AMP! </body> </html> --001a114634ac3555ae05525685ae Content-Type: text/html; charset="UTF-8" <span>Hello World in HTML!</span> --001a114634ac3555ae05525685ae--