The US financial authority does not consider Internet email secure, but is encouraging the public to use it to report insider trading.
The Securities and Exchanges Commission (SEC) has opened 13 email boxes for the public to report violations of federal securities law, find information, complain about competitors, ask questions about the SEC and even comment on SEC rulings.
In a statement, the SEC admitted: "Because electronic mail on the Internet is not secure, you should not send confidential or sensitive information. Further, responses sent over Internet email are not considered statements of SEC policy or Commission opinion."
The SEC confirmed it will only accept formal filings sent by post but will investigate instances of alleged fraud or unauthorised stock trading when sent in via email.
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