Back and 2002 HHS.gov posted the following,
Are the following entities considered "business associates" under the HIPAA Privacy Rule: US Postal Service, United Parcel Service, delivery truck line employees and/or their management?
Answer: No, the Privacy Rule does not require a covered entity to enter into business associate contracts with organizations, such as the US Postal Service, certain private couriers and their electronic equivalents that act merely as conduits for protected health information. A conduit transports information but does not access it other than on a random or infrequent basis as necessary for the performance of the transportation service or as required by law. Since no disclosure is intended by the covered entity, and the probability of exposure of any particular protected health information to a conduit is very small, a conduit is not a business associate of the covered entity.
One Avenue is just like the post office. We do not collect or store patient data in any form nor do we allow any medical data storage at this time including long term eMail. HHS reference can be found here.