Calling the Sender or Another Recipient This feature is not yet public. You can launch an audio or video conference with an E-Mail's sender or recipient by calling the sender or recipient. Prerequisite: You have set up an account with an audio or video conference provider, e.g. Zoom, Jitsi How to call an email's sender or recipient: Select an email. Click on the sender or on a recipient in the detail view. A pop-up opens. An icon below the name indicates the contact's presence status. In the pop-up, click the Call icon. In the menu, click on an audio or video conference provider, e.g. Zoom. The window for calling the contact opens. Click on Call.