Email w/ anonymous submit & attachment capture in TT?

Question posted 6/2/10 by Maryann Morris

I working on a mashup workflow which needs to have the following ability (ideally):

generate an email to an outside vendor providing them an email address or link to submit their appraisal documents
vendors would submit their documents in attachment form to that link/email
workflow would capture the attachments pertaining to that particular workflow (or ticket).

In the administrator there is the notifiations tab which gives me the ability to create the email notification as well as the web service "GetAttachmentCollection", however is the above possible?