This is excellent!
I can definitely see what you’re saying about how Hybrid/Spongy can create a better experience by adapting to any screen size. But I’m curious, how it is better for accessibility? That would be a huge plus for demonstrating its value to others.
And as for the div-only (and mostly div-only) layouts, my interest in that was actually sparked by “Get Off The Table” – so thank you for creating and sharing that! I’d love to do some more research into all the special mso code in the near future when I get the chance.
I'm personally a huge fan of Atom for the sheer number of community packages that make it endlessly configurable and customizable. (Plus it looks amazing). It's a trailblazer for “hackable” desktop apps built with web technologies (Electron).
Litmus Builder is also fantastic (of course)! How could you go wrong with an editor designed specifically for developing emails? The instant previews is a killer feature. I'm almost all-in with using Builder start-to-finish. There are just a few handful of features I have in Atom that aren't in Builder yet.
I'm interested whether Dreamweaver is still as popular as it was 3 years ago – does the web preview still render like Outlook?
It looks like mcsv.net is a MailChimp server domain (https://mailchimp.com/about/mcsv/). My guess is that this particular destination email address relates to that specific subscription list in their database, and the subject line and from address are what remove your email address from the list.
I would also guess that each sender requires a different method of the "email-in" unsubscribe. So maybe the "unsubscribe" doesn't work universally unless Apple knows what message to assemble and send.
I just tested this! It sends an email like this:
From: [my email that was subscribed]
Body: iOS Mail sent this email to unsubscribe from the message “Learn Linux in 5 Days [Download]”.