My friend said that we can send mails to a gmail ID omitting the '.'. Still it goes to the same person.
Code:
For e.g the real email id is john.1@gmail.com. 
Instead of using john.1@gmail.com in the To field he used john1@gmail.com
He said he verified this with his account. When he tried to send using the second email id the mail got landed in his inbox. is it a real feature of gmail or there is some error in this.