Can attachments be stored on server as separate files?

Gentleones,

I have an HP Digital Sender 9100C which, in and of itself, is probably a bad thing. Suffice it to say that it’s a Windoze-dependent, high-volume scanner, but has the unique (well, for 1999 it was unique) ability to scan straight to an SMTP server for delivery to an E-mail recipient. The document format is PDF, TIFF, or some others, but PDF is the one for us. Anyway, every other service it handles is Windoze-dependent.

What I’d like to do is set up a Mac near it running some form of SMTP server. The server would have the responsibility for receiving the E-mail (duh) and providing a network-served folder that contains all of the attachments so that someone else can retrieve them and further process them. (This is to be an archiving process.)

This particular Mac will run 10.3 straight–no Server here. What SMTP server should I use? Is there one that processes and detaches (so to speak) attachments? Or is there one which is extensible to do that task?

Worst case is that I set up a separate E-mail address just to receive these scans, but, unfortunately, that means a round trip over the interoffice VPN which runs at a glacial 256kbps.

Many thanks,
Bill