How can you authenticate to the Zimbra SOAP API using a regular user account?

Regular user authentication is done via the `Auth` request under the `zimbraAccount` namespace, sent to the endpoint `uri + "/service/soap"`. You provide the username and password in a SOAP envelope; the response contains an `authToken` used for subsequent requests. Example code is available in the [Zimbra SOAP API Development Guide](/news/zimbra-soap-api-development-guide).