In what could be the largest data breaches ever, a misconfigured spambot just spewed out over 700 million that hackers have been using in their attempt to break into users’ email accounts.
Australian computer security expert who runs the Have I Been Pwned site, Troy Hunt wrote in this blog post that this is “ the largest single set of data I’ve ever loaded into HIBP. Just for a sense of scale, that’s almost one address for every single man, woman and child in all of Europe.”
The data was available because the spammers failed to secure one of their servers, allowing any visitor to download many gigabytes of information without needing any credentials. It is impossible to know how many others besides the spammer who compiled the database have downloaded their own copies.
You may want to run your email address at Have I been pwned? though we are not sure what they do with the email address they scanned for users.