How do I perform a SOAP login using pre-authentication and retrieve an auth token?

To perform a SOAP login with pre-authentication, send a POST request to `/service/soap` with a body containing the username and the preauth token (`<preauth>` element). The server responds with an `<authToken>` if successful. You can then reuse this token for subsequent SOAP operations like listing folders. Code examples for both the login request and folder retrieval are in the [Zimbra SOAP API Development Guide 6 - Pre-authentication](/news/zimbra-soap-api-development-guide-6-pre-authentication1). For more SOAP basics, see the [Zimbra SOAP API Development Guide](/news/zimbra-soap-api-development-guide).