Adobe Sign and HIPAA

I apologize if this has already been asked, but I didn't see anything when I searched. 

We use Adobe Sign for surgical consents and contracts.  I understand that Adobe Sign itself is HIPAA compliant, but what about when it sends a copy of the signed contract to all parties?  My understanding is there needs to be some sort of secured link that you click on to view the documents to make it HIPAA compliant.  The fact that it is just an attachment would not make it secured. 

Thanks!