Duo Security two-factor authentication for Roundcube. Users have multiple ways to authenticate, including: 1. One-tap authentication using Duo’s mobile app. 2. One-time passcodes generated by Duo’s mobile app (works even with no cell coverage) 3. One-time passcodes delivered to any SMS-enabled phone. 4. Phone callback to any phone (mobile or landline!) 5. One-time passcodes generated by an OATH-compliant hardware token
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