It mentions @media queries working in the iOS Mail app, but as best as I've been able to decipher, they're still fairly broken (whereas Android's Mail app and K-9 aren't).
Specifically, it always reports that the mail is in landscape mode (even in the default portrait) and doesn't set max-width to a larger value when in landscape mode, making it (again, as far as I've been able to figure out) impossible to create different HTML mail layouts for landscape and portrait modes.
Specifically, it always reports that the mail is in landscape mode (even in the default portrait) and doesn't set max-width to a larger value when in landscape mode, making it (again, as far as I've been able to figure out) impossible to create different HTML mail layouts for landscape and portrait modes.