Un point sur le développement HTML et CSS des emails. Et c'est toujours autant la merde.
Le seul début de solution ? MJML.
While this might sound uninspiring — lower your expectations. Seriously. If you're working with designers, let them know how complicated everything is.
And don't ever think you can write "clean code" and have everything neat and tidy and working. Something somewhere will not work.
You can NOT outsmart email clients.