Thousands of internet users have had their email accounts switched off following a huge online scam.
Over 30,000 passwords to email accounts including Hotmail, Google mail and Yahoo where posted on the internet.
Loads of people were tricked into giving out their email addresses and passwords to computer hackers.
People whose emails were affected were then locked out of the accounts but can re-register to get back in to read their mail.
This kind of scam is called phishing as it tricks people in to giving out private information like passwords on fake websites.
The people at internet company Google say they are aware of the scam and are now doing everything they can to make the accounts that were targeted safe again.
If you are worried about your email account then ask your parents or a teacher to help you reset your password and keep it safe.