bgcolor (and probably others) should probably not be inlined

[dorianmariecom]

See for instance: https://www.litmus.com/blog/background-colors-html-email/

background-color and background CSS properties are better supported now than bgcolor

I know there is the css_to_attributes setting, and that's what I'm using now but I think that should be the default and maybe have attribute inlining disabled

see RELATED_ATTRIBUTES in lib/premailer/premailer.rb

[dorianmariecom]

e.g for instance with tailwind, background-color: rgb(255 255 255 / 1) makes the background green

[grosser]

agree in general, would be open to either being very selective about what to use (for example only doing 6 digit hex) or removing altogether
... depends on how much messier this makes the code and how many end-users it will break :(