Use of fake name and email to expose illegal activities.

Dear Client as per your legal query,
If the authority believes the complaint was false, malicious, or meant to damage reputation, the provisions of BNS would be Section 356 Defamation , Section 217 BNS Giving false Information to a Public Servant . If a fake email account was used for deception, authorities may also examine it through provisions of the Information Technology Act , 2000.
This needs a detailed guidance , for further information regards the same feel free to contact us . 

Dear Client, as per your query, In India, filing a complaint under a false name and email to lodge an official complaint is considered an offense, even if it is to expose illegal activity. The government usually does not actually take action on anonymous or pseudonymous complaints, as it is considered not actionable for investigation, and action may be taken against the complainant for giving false information and misrepresentation of their identity. I hope this answer is helpful. In case of further queries, please do not hesitate to contact us. 
Thank You.