hi  gmail ignores dots / no dots  and capitals / no capitals in email addresses, so  its a very common error of someone giving out your email address by mistake and thinking it is theirs


you can reply to the sender to inform them or filter them to trash

you own all variations of youra...@gmail.com and there are no other Gmail accounts that have your account name with / without the dots or capitals / lowercase in them , and no one else has access to your mail

so :

youra...@gmail.com = your.a...@gmail.com = y.o.u.r.a....@gmail.com  = Y.o.U.r...@gmail.com

you can email yourself on all of these to test as well as logging in using any of these variations and YOUR password , also  go to mail settings > accounts > send mail as > add address you own > type that  account name with / without the dots - you will be able to add it without a confirmation mail being sent because you own it

also to prove this log out , click create account , type 5 letters and a dot - it will say " Please use between 6 and 30 characters."


references :

http://xinovia.blogspot.com/2012/01/dot-in-gmail-username-recieving-someone.html

http://gmail-help-blog.blogspot.com/2012/01/getting-someone-elses-mail-dots-issue.html

http://knol.google.com/k/gnutt-halvordsson/getting-someone-elses-mail/tmc0tx1gq52i/6

http://support.google.com/mail/bin/answer.py?hl=en&answer=10313

https://groups.google.com/a/googleproductforums.com/forum/#!msg/gmail/1kb9GtZ9n2U/algb83gy30sJ

http://blogoscoped.com/forum/603-full.html

http://www.makeuseof.com/tag/1-awesome-gmail-tip-you-dont-know-about-seriously/

https://productforums.google.com/forum/#!starred/gmail/1Q3uBiaoR-4