India post web host adopt CAPTCHA based tracking to avoid unwanted delay in India Post Tracking of eMO, Regd Article , Speed Post Article etc.
A CAPTCHA (an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart") is a type of challenge-response test used in computing to determine whether or not the user is human.
Some Other Link also added under tracking :
* Register Compalint
* Track Your Complaints
* Locality Based Pincode search
* Option To Locate dDelhi Post Office on web
* To Track International Article & Parcel Tracking : " IPS WEB TRACKING "