NetEase Inc, China's largest e-mail service provider, is planning to launch a notary mail service in August in an attempt to stave off the challenge of social media services and increase its appeal to young Internet users.

The Nasdaq-listed Internet technology company has been making efforts to offer innovative value-added services to boost user loyalty.

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The new service ensures all information that goes through the electronic mailboxes cannot be changed or deleted, in case users want to notarize e-mail information.

More and more users have requested original e-mail information for notary use, said Mo Zirui, deputy manager of NetEase's e-mail business unit.

"They need us to prove that they have got certain messages in e-mails," Mo said. "So to meet the increasing demand, we decided to offer notary mail service."

With a growing number of teenagers in China becoming mobile Internet users, the e-mail usage rate in the country has dropped significantly in recent years, according to Mo.

"It is critical for us to offer value-added services rather than simply supporting basic functions like receiving and sending e-mails," he said.

He said Chinese Internet users are preoccupied with social networking services, such as Tencent's QQ and WeChat.

The China Internet Development Statistical Report released in January by China Internet Network Information Center revealed e-mail is used by 92 percent of Internet users in the United States, and is the top application, while in China the figure is only 42 percent and e-mail is ranked 13th among Internet applications.

The report also stated 26 percent of China's Internet users are under 20 years old.