When I use BCC, all the addresses go to everyone. Why? How to fix?

When sending group mail, I use BCC because it is supposed to only show the individual that the message is addressed to and not show everyone else addr

When sending group mail, I use BCC because it is supposed to only show the individual that the message is addressed to and not show everyone else' address.
How can I fix this?

or:When sending group mail, I use BCC because it is supposed to only show the individual that the message is addressed to and not show everyone else' address.How can I fix this?

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