How do I - send an email to new leads created within the current week and who have not been sent an email yet?

How do I - send an email to new leads created within the current week and who have not been sent an email yet?

 Hi,

I need to send an email to new leads created within the current week and who have not been sent an email yet.

I can build a report in Reports that automatically selects 'Last week' as the date range and I can query some of the Email attributes such as Email Creation Date and Subject, but in the report it generates there are no clickable selection boxes on the left which, were the same filters be available as a Custom View in Leads,  I would use to select the items prior to selecting Email from More Actions.

In other words, how do I bulk send an email template message to new leads created within the current week and who have not received an email yet? 

With thanks.

Brixnmorta