In the wake of two large breaches at Yahoo that compromised a billion accounts, including users' email addresses and passwords, experts say email accounts are a major target for criminals.
"When an attacker compromises your email account, his possibilities are limitless," said Omri Iluz, the co-founder and CEO of PerimeterX, a cybersecurity company.
WikiLeaks aside, it's not necessarily the content of your emails that cyberattackers care about. More likely they're using your account to make money.
Since many accounts use email addresses as the log-in or to reset passwords, email accounts are highly connected to your online identity, including banking and shopping accounts.
"[A hacker] can go and log into any account that you have by simply clicking on the 'forgot my password' [button] and getting a new password to your email. He can create new accounts by using your email and faking your identity," Iluz said.