Why should I use two-step verification?
View the instructions below for enabling two-step verification for Yahoo! and Google Mail.
If you have another provider, look for the instructions in your security settings.
If you choose not to do this, or your email provider does not offer two-step verification, be extremely careful with your email password and change it regularly to keep it secure. Additionally, use caution when clicking on links from any email, and always begin an email session from the official login page of your email provider.