But some wondered if the email actually was from Amazon, since it did not provide a secure link -- meaning the "s" was not included with "HTTP:" in the url -- and advised that customers did not need to change their passwords, according to posts on Amazon's Sellers Central forum.
The email assures customers that the issue has been fixed but did not disclose what exactly happened, The Verge reported.
The Verge contacted Amazon about the emails. A spokesperson said the site or systems were breached. Officials with the company didn't say how many customers were affected.