The online retailer has revealed details of the mishap this week, and explained it has fixed the problem and contacted those who could have been affected.
A spokesman said in a statement: "We have fixed the issue and informed customers who may have been impacted."
The company explained the information was shared as a result of an unfortunate technical error, and clarified that its systems and website had not been the subject of a security breach.
In an email sent out to users, it added that customers didn't need to change their passwords or take any further action.
Amazon is yet to reveal how many accounts were exposed, and where the email addresses ended up.
The email read: "We're contacting you to let you know that our website inadvertently disclosed your email address due to a technical error.
"The issue has been fixed. This is not a result of anything you have done, and there is no need for you to change your password or take any other action."