Beware fishing email with text, for example, like this: Due to the increasing number of phishing attacks and holders requests from the ETH network, we decided to implement Two-factor Authentication on all ETH wallets.
Please visit Myetherwallet.com/#two-factor to upgrade your wallet to the new security level.
Please be aware that you will not be able to access your funds, tokens and wallet anymore if the new security protocol is not implemented.
We are taking this measures to protect both you and our network from phishing and malicious attacks.
Thank you for your cooperation and understanding,
The Ethereum DEV team.
I've already caught. Don't send them private keys.