secondary email address and email log
I think it's important to see the results of each email in the Email Log. The capability to CC to additional email addresses is a HUGE step forward. However, the Log does not include the additional email addresses. It looks as if they don't exist, there is no way to know it worked unless you include a QC profile.
Becky Parsons commented
That issue is the reason I am not using the "additional email" function. It would leave me without accurate information about sent emails.