BambooSes.Message.Destination.put_bcc
You're seeing just the function
put_bcc, go back to BambooSes.Message.Destination module for more information.
Adds single recipient or list of recipients to the "Bcc" field of the destination struct
Example
put_bcc(destination, [{"John Doe", "john.doe@example.com"}, {"Jane Doe", "jane.doe@example.com"}]
put_bcc(destination, {"John Doe", "john.doe@example.com"})