It’s about post by mail.
While I tried to post via outlook, and chose HTML format, wordpress could receive it but not display it correctly. only the title could be recognized, but the body of mail was discarded, even the page couldn’t be fully displayed. I checked the source file of mail and found there might be some html symbols that wordpress couldn’t recognize. I googled it but got nothing.
Outlook has two more format options: text and RTF. I tried both.
Text format can be displayed but all words huddle together in the same line.
RTF works perfect. So I can change my mail client to outlook 2007 now, a really good-looking one.