I really believe the attachment is being created by Aware.
The exact bsv executed under build 1206 does not have an attachment on the email but executed under build 1218 it does.
On the Aware change log for build 1209 the eighth improvement is:
'E-mail message formated in the HTML format are sent as HTML message'
Could this be causing the attachment?
I have nothing in the HTMLMessage of the OutgoingEmail Notification.