I think that "what's up" is more like a "hello". If so, you should change it into "ä½ å¥½å·ç ?", otherwise in Chinese it sound's like something bad happened and you are asking what happened, or that you had been a little disturbed by that mail.
pluiepoco에 의해서 마지막으로 검증 또는 수정되었습니다 - 2008년 4월 30일 10:00