Meera Emmanuel, reporting for Bar and Bench:

Justice M Nagaprasanna issued the direction while dealing with a petition filed by a company named M Moser Design Associates India Private Ltd (petitioner) after vulgar emails about its employee were sent using Proton Mail to other employees and the company’s clients.

and

Representing the Central government, Additional Solicitor General (ASG) Aravind Kamath had earlier told the Court that the Centre may have a limited role in giving effect to the petitioner’s prayers concerning investigation into the emails regarding its employee with the cooperation of Swiss authorities.

Jagmeet Singh has some additional bit of reporting over on Techcrunch:

Last year, the police department of the southern state of Tamil Nadu had sought to block Proton Mail after the email service was found to have been used for sending hoax bomb threats to local schools. The Indian government’s IT ministry reportedly notified internet providers to block Proton Mail at the request of law enforcement. However, the Swiss federal authorities intervened to prevent the blocking of Proton Mail taking effect.