How can I add "undisclosed recipients" to my e-mail?

How can I add all recipients of an email I received to my address book?

• Answer:

  If the recipients to the message were bcc'd, you can't. A bcc is processed ("exploded") to the recipients by the delivery server(s); essentially, the bcc list is an instruction to delivery servers to deliver a copy of the message to each person on its domain, whose addresses may be found in the list. Accordingly, the actual message never contains recipient addresses in its own mail headers. For a message that has been cc'd to a list, the situation is different. Every delivery address is in the "To:" header. Just open the headers, and copy and paste the list, or, one by one, the addresses to your contact manager.