I feel like nowadays there is no privacy especially when it comes to emails. Third party apps like Truecaller require the applicant to give them access to their email account. Honestly, I don't trust such applications and I maybe paranoid but how easy is it for the to steal other critical information from your email. Sometimes I feel like my email is naked!!!!
Don't apps ask for your permission for this kind of thing? They do. So, how's it stealing if you're the one giving them permission?
Also, you can uncheck any of the permissions when you signup or even after installing the app.
Check this out: http://www.howtogeek.com/230683/how-to- ... droid-6.0/
BTW, this feature has been around since Android ver 4.0, and has been explicitly available since ver. 4.3.
And Truecaller is a legit Swedish company not a shady operator working out of some crazy location. The company is in bed with google, microsoft and the like. Its expanding its operations now: http://techcrunch.com/2015/07/07/trueca ... messenger/
Also, I thought truecaller only asked for phone numbers to login, so I don't know why you needed to provide your email address anyways! It doesn't steal info, it builds a public directory on the cloud using information about phone numbers that you provide, so that when the next time an unknown number calls and its the President of the United States or Ellen calling you, you know that its them for real
Also, it lets the community ensure that idiots, bigots, and crazed pollsters are reported so that people know not to pick up. Look at the impact the app's made:
http://techfinancials.co.za/2015/12/03/ ... s5LHlR97IU
Finally, Google and Apple are fairly strict about privacy, so don't worry about your info getting stolen. When they're not letting the FBI into a terrorist's phone, what makes you think they'll let someone steal your email contacts?