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  1. Webinterface OTP, everything else password: With this option you set up so that it works like most other e-mail providers with two-factor authentication. You can log in to the web interface with your PIN and one-time password and continue to use all other services such as IMAP, POP3, SMTP, WebDAV, CalDAV, CardDAV or ActiveSync with your (normal) password. So you can continue to use local email clients on your PC or smartphone, synchronize calendars, etc.
  2. OTP only for web interface, all other services off: This is a special feature of If you select this option, you can only log in to the web client, the office with secret code and one-time password. All other services will be deactivated for your account. You will not be able to use local email clients or synchronize data.

First click on "Submit Query". Be sure to create or activate an OTP token.