When you create a web form with the Username and Password fields included the form will also send out an email with the username details. With recent changes to BC passwords are not sent out as plain texts and come as a reset / recovery links.
Just collecting details and have these added to your CRM ready for future integrations or if your running an "on approval" service can be something you often do and you do not want this email going out.
There is now a new parameter called SWE that decides whether or not the Secure Zone Login Details email will be sent when the form is submitted.
By default, this new parameter is not included in the query string and its set to "True" (email will be sent). If you want to stop this email from being sent should add "&SWE=False" in the action of the web form.
The already existing parameter named "SAR", that decides whether the WebForm Submission Confirmation AND Secure Zone Login Details emails are sent remains unchanged.