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Something like this?

https://addons.prestashop.com/en/emails-notifications/42587-bcc-all-email-to-admin.html

https://mypresta.eu/modules/administration-tools/send-a-copy-of-emails-bcc.html

Either in classes/Mail.php line with "public static function Send()"

Should look like that:

$send = $swift->send($message); 

Change to:

$message->setBcc(array('[email protected]'))

PS: change [email protected] to your email address