Sunday marked the 27th anniversary of the first email ever sent from China.

On September 14, 1987, a computer laboratory in Beijing successfully sent an email that said, "Across the Great Wall we can reach every corner of the world." The message was sent to a German university.

Twenty-seven years later, China is home to 632 million Internet users, the largest online population in the world.

The Internet Society of China said in an open letter on Sunday that the Internet is widely used in the areas of politics, economy, culture, medical care and education, and its influence is far-reaching.

The society called on Internet users to take responsibility and jointly work for the healthy development of the web.