Did you follow Email::Sender's QuickStart instructions for Bcc?

Based on that, and the envelope information section on the same page, I would think your sendmail command should be something like 

$email_s->header_set('bcc');  # remove Bcc from headers, otherwise eve
+ry recipient can still see the whole BCC list
sendmail($email_s, { transport => $transport, to => [$bcc1, $bcc2, ...
+] });

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In reply to Re: Sending email by pryrt
in thread Sending email by frank1

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