In the last few years, phone tapping and email interception has become rampant.

This article on email interception and phone tapping in India  explains how it is done.

It appears that many times this facility is misused to harass people or get information on business rivals.  A month ago , emails sent to 2 of my email addresses disappeared.  I contacted the ISP , who gave me complaint numbers , but  are unable to give a logical explanation for the same even after a month.

I hope there will be  greater transparency in the system in future.