The email headers do have the clean info for sent & received email.
Example for a sent message.
X-Antivirus: avast! (VPS 130520-1, 21/05/2013), Outbound message
X-Antivirus-Status: Clean
Not exactly what DavidR has shown how to do (what you wanted).
But the message is there in the header already and an email scanner should be able to find it and use it.