You can't BCC, but you could send an alert to that sales rep if you really want them to receive a notification of EVERY email sent. You could customize the alert so that it is an exact copy of the email being sent, but include details for the rep such as "This email has just been sent to {{Lead.First Name}} {{Lead.Last Name}} at {{Lead.Email Address}}. Could you please follow up?"
Personally, if I were the rep I'd rather just have the list of names/email addresses and work down the list with follow ups - especially if the follow up is a call.
Other options include:
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Automating an email follow up to those leads on behalf of the rep
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Creating a task for the rep on every email sent and the rep can work down the task list