Minify them.
Gmail clips long emails, preventing users from viewing the entire email unless they click another button and coincidentally often stopping tracking images from being loaded.
This will also often break the formatting of the email, by cutting things off in the wrong place.
There’s no way, as far as I know, to completely stop both clipping and message quoting – but minifying the email makes a huge difference.
It’s also, of course, great practise to reduce the amount of data used to load the email, helping things feel great on mobile devices.
Do you have any tips or tricks for making emails great across multiple clients? Tweet us.