BCC Not Working in Yahoo?

I asked an unrelated question about a red blocking symbol shown on every one of my "All Sent" emails. A reply said to "Click on your name on the email the email you have sent (so go into your "Sent" folder). Then click on your name once or twice. Then scroll down and press the "unblock Contact" option." That removed the blocked symbol from all my "sent" emails. That also reinitiated my BCC emails to myself.