Sending threatening or obscene emails or messages in India can lead to punishment under the Information Technology (IT) Act, 2000. Specifically, Sections 66A (now struck down but relevant for understanding the context) and 67 address such offenses. Section 66A, before its removal, dealt with sending information that is grossly offensive, menacing, or false to cause annoyance, inconvenience, or injury. Section 67 deals with publishing or transmitting obscene material in electronic form.