Soooooo happy that my mail client is not even on the list here. It automatically strips out anything remotely looking like html and it sends out plain text emails only, as email was designed to be and should still be. Anyone sending me css garbage will be directed to /dev/null. Thanks.
Reminds me of someone I knew 15 years ago, who often said "Anyone sending me text messages with abbreviations doesn't deserve a response". Sadly, now this guy has hardly any friends.
(Some email clients for humans probably add a bit of html and css to everything, but you get what I mean. It still looks like plain text)