A typical Internet service provider collects a great deal of information in the course of providing services. There's nothing in ECPA that prevents a telecommunications service provider or an ISP from disclosing that information that is already collected. What it does prohibit is someone specifically using a computer program to collect e-mail addresses. If they already have e-mail addresses in the course of their business, there is nothing that prohibits the disclosure of them.
On June 18th, 2009. See this statement in context.