Show emails sent on Enquiry

It is possible to send an email on an enquiry by clicking the envelope button on the email address entered on the enquiry. In an attempt to keep the contact/company records clean, a customer may want to make contact with the enquiry before converting it to make sure the request is genuine. There is no way to see on an enquiry if any emails have been sent out on these enquiries. Allow users to see these past emails on the enquiries would allow them to better manage these and to determine which are genuine interest and which are not, before converting these into their workspace.