I'm curious what approach they took, because iframes don't really work in email (the majority of the clients block them, including gmail which they use in their example). Another option would be an image rendering of the message, but that would be pretty annoying to the recipient for not being able to select, copy or re-flow text.
The content displays automatically in the email client. The link is only relevant if you want to copy/paste/make in-line comments. Thanks for your comment.
We support unsend at anytime. We technically could also support edit at anytime, even after open, but we do not because we believe editing after open serves no legitimate purpose - just manipulation. It doesn’t even seem fun to us. Thanks for commenting.
Based on https://www.sendpluto.com/help, it looks like they could be creating images of the email text and sending the images in an email. That way, they're free to manipulate the image even after the email is sent.
Correct. The scheme requires some way to link the received e-mail's content to Pluto's servers. This must be so because it's not possible to delete or modify an independent email (i.e. one without links) once it's been delivered.
