From Yahoo! News:
China is cracking down on junk e-mail and “illegal” mobile phone text messages, the official Xinhua News Agency said Tuesday.
A new regulation will ban sending e-mail for advertising purposes to people without their permission, and all advertising e-mail must be titled “advertisement” or “AD,” the agency said.
It also said that mobile phones must be registered under users’ real names, and that text messaging will be controlled more tightly due to the spread of “illegal messages.”