Australians use 'cheers' quite often to end an email.

In Australia, Cheers is just a casual way of saying thanks. It can also be used to say 干杯！ 就是谢谢你的意思，比较随便的用法。比如你可以跟你的朋友说 “cheers” 但是不能跟你的老板说！

basically we don't use cheers to express meaning of thanks but we use it when we want to appreciate someone's joy and pleasant moments.

In the US, we don't use the word at all, except possibly as a toast when drinking. Even then, it's not commonly used here.

your answer is excellent!!teach me a lot.haha ..thx.