gmail – Can someone have the same email address as me?

About 10-12 months ago I started receiving emails addressed to someone else. The first time it happened I figured it was just a typo on the senders part. But then I got more emails from different senders, all addressed to the same person (with a similar name as mine). I’ve received emails for her ranging from job interviews, order and shipping confirmations to the most recent one being a legal document that looks rather important. The other person lives in Canada while I live in the US – is it possible that she has the same email address but with @gmail.ca (instead of @gmail.com)? Since I’ve received so many of her emails, it makes me wonder if she’s received any of mine? I just want the emails to stop and I dont know how to do that aside from sending her a letter (i have her full name and address but the letter would be international and i dont feel like paying to tell someone to change their email address)