What is 2FA (Two-Factor Authentication) in email security?
Two-factor authentication requires two different authentication types: something you know (password) plus something you have (phone, security key) or something you are (biometrics). Compromise of one factor isn't sufficient for access.
Email 2FA typically uses: SMS codes (least secure, SIM swap vulnerable), authenticator apps (time-based codes), or hardware security keys (most secure). Most email providers support multiple 2FA methods.
2FA significantly reduces account takeover risk. Even stolen passwords don't enable access without the second factor. Enable 2FA on all email accounts, especially those used for business or sensitive communications.
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