Hello dear EOA team,
I wonder which version of Gmail app for Android 6 are you providing for testing? Somehow I have the feeling that this Gmail version works in a quite unique way:
1. It seems that this Gmail version supports embedded <style> and media queries;
2. As long as I use attribute selectors in the media queries (such like *[class=“foo”] this Gmail version won’t ignore these CSS definitions, it seems that it will execute these css commands and at the meantime strip the media query conditional call (@media only screen and (max-width:480px)) out. And of course the newsletter is completely bad looking then.
I know Gmail for Android begins to support embedded <style> and media queries at the moment. But on our Samsung Galaxy S7 and S5 (both with Android 6.0.1) the Gmail app won’t act this way: it will completely ignore the css commmands within the attribute selectors.
On our Honor 7 (Android 6.0) the embedded <style> and media queries are not supported in Gmail app. So the app can only show the desktop version.