Restrict email to signers

Hi, I have a requirement where I need to get the signing URL like shown here http://docs.esignlive.com/content/c_integrator_s_guide/rest_api/signing_url.htm I able to successfully get the signing URL, this URL will then be embedded in another system for use. As a result, I need to stop the eSL email from being sent to the signers once a package is created in Inbox. Any idea how can I do this. Thanks a lot, Sudhangi