The last spam list that held the record of "largest leak" was 393 million records. Today it's 711 million.
Threat researcher Tony Hunt was the first to analyze it, and has since uploaded the database to haveibeenpwned.com.
Have I Been Pwned, which Hunt created, is a breach notification site where you can enter your email or username to see if you're the owner of an account that's been compromised.
Hunt was originally contacted by @benkow_, the Paris-based security researcher who discovered the list.
The spam list, which contains 711 million records, is the largest to date and was described by Hunt as having "almost one address for every single man, woman, and child in all of Europe."
The data itself is just a giant spambot, containing nothing other than email addresses, passwords, and servers used to deliver huge amounts of spam.
The database is coming from an IP address based in the Netherlands, and local law enforcement has been contacted.
Ironically, Hunt's own email is listed twice in the database:
To illustrate the size of the database, Hunt points out that it took him 2.5 years for his site to accumulate 711 million compromised accounts, while this set presented that same number in just one go.
Interestingly enough, Hunt randomly selected a group of email addresses and found that every single one of them was one of the records exposed in the LinkedIn data breach in May 2016 that affected 164,000.
While spam is certainly annoying, the real threat is having that large of a database of real email addresses that can seep through spam filters and distribute malware through malicious links or attachments.
"If you're a malware researcher, it's time to look deeper in the spambot business. It's a creative market which interacts with a lot of other cyber crime business," says @benkow_ in a blog post.
Wondering if your information made it onto the list? Check here.