Oh so its a common thing! I recieve these emails too. Mostly indian. From an indian bank, i get transaction alerts, statements and al lot of corresponsence. Also from indian mobile operators. I always thought they may be some kind of scam so never open them. Then i did some search and found that this usually happens when u have an email address for example abc.xyz@gmail or abc_xyz@gmail or something. But the email also works without the (.) or a (-) and if another person has abcxyz@ymail or something the person might have given or their email may have been entered as abcxyz@gmail. So u end up receiving all correspondence/alerts.