Could you please insert a screendump showing your setup and another showing the script?
Could it be that you have selected this option:
This would create mails as you describe: One for each record in your present found set.
Btw: I would suggest that you do not send via email client but consider sending via SMTP, but that's another issue.
You were 100% correct. I assumed the command meant it would be sending just one mail and not all the recipients in the CC or BCC...