When using workflow notification emails it is often needed to have an internal mailbox receive a copy for verification purposes, but many times clients do not want that address published to outside recipients. It would be best to simply add BCC as a "Send mail" option.
I have / had same requirement for some customers. I made a workaround to handle this in past with Entry points in Workflow but when using Syracuse Notification Server this Entry points got lost and I have no chance to handle this again. So a BCC option in standard would be fine.
Yes, this is a duplicate of https://sagex3.ideas.aha.io/ideas/SX3PL-I-194, we'll keep this one open to account for the votes!
Seems like a duplicate Idea is here: https://sagex3.ideas.aha.io/ideas/SX3PL-I-194