There are specific laws in the United States that are applicable to e-mail investigations. The only requirement of is that the sender must provide some mechanism whereby the receiver can opt out of future e-mails and that method cannot require the receiver to pay in order to opt out.

the CAN-SPAM Act

Explanation:

The CAN-SPAM Act is a law established by Congress in the United States that provides compliance with the guidelines on business emails. It spells out the rules that must be strictly adhered to when sending out business messages. A recipient who receives an unsolicited commercial or business email is empowered under the act to ask for it to stop. Failure to comply with the requirements, as stated by the act attracts, a Fine. However, for every general rule, there are exceptions. The Act does not include transaction or relationship messages. It aims at curtailing the rapid growth in unwanted commercial electronic mail messages.

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