I highly recommend running a quick test! see if you receive an email if you use CC from customer or transaction record...all appears normal except it does not send to either primary recipient or anyone for that matter! only when CC is used...if additional recipients use "TO" or "BCC" then it works. This exists across all customers...and we dont have a clue how long its been happening because for all logging purposes in netsuite, there is no delivery failure, it logs under messages as intended, etc. no errors! but confirmed and replicated multiple times with netsuite support today and they are investigating from here. very bad scenario to look out for!