You can remove the previous addresses

It’s really easy.
You have to click on “forward” first—-then highlight those previous address (and anything else you don’t want)—and then press the delete key on your *keyboard*, and they are erased.
Sometimes it’s better to only do small bunches at a time.

For smaller areas,(or stubborn areas) you can just backspace them out—and you don’t even have to highlight for that.

When you do send it, I’m sure you’re hidding your recipients in the BCC line—-????—-aren’t you ???