As per your reference I will provide you information of Delhi Police and will also get Commissioner of Police, Delhi e-mail ID so that you can check it easily.

The Delhi Police is the main law and order agency for Delhi is one of the largest metropolitan police forces in the world which has 6 Ranges, 13 Police Districts, 62 Sub-Divisions with 184 Police Stations and 5 Specialised Crime Units.

Here is the e-mail ID of Commissioner of Police, Delhi

Commissioner of Police, Delhi
cp.alokkumarverma@delhipolice.gov.in

Ranks
Commissioner of Police (CP)
Special Commissioner of Police (Special CP)
Joint Commissioner of Police (Joint CP)
Additional Commissioner of Police (Additional CP)
Deputy Commissioner of Police {Selection Grade} (DCP)
Deputy Commissioner of Police {Junior Administrative Grade} (DCP)
Additional Deputy Commissioner of Police (Additional DCP)
Assistant Commissioner of Police (Assistant CP or ACP)
Inspector
Sub Inspector
Assistant Sub Inspector
Head Constable
Constable

Services
Missing Children
Missing Persons
Un-Identified Children Found
Un-Identified Persons Found
Un-Identified Dead Bodies
Senior Citizens Registration
Stolen Vehicles Search
Unclaimed Vehicles Search
Missing/Stolen Mobile Phones
SMS Services of Delhi Police
Guidelines / Information in c/w passport verification and registration of Pakistan National
Most Wanted
Downloadable Forms
Go's Mess Accommodation & Tariff
Welfare
Government Service Verification (CVR)

Address:-
Delhi Police
MSO Building, Indraprashta Marg, IP Estate, New Delhi, Delhi 110095

Phone:-
011 2349 0010