In message <Pine.LNX.4.44.0305210915010.1078-100000@icestorm.tfcc.com>, Chris F
uhrman writes:
>
>popa3d was written with security in mind by Solar Designer.  You'll have 
>to dig through it's documentation to check and see how to get it to 
>support SSL.
>

That seems to be the preferred choice, coupled with stunnel for ssl.  
My thanks to everyone who responded.

		--Steve Bellovin, http://www.research.att.com/~smb (me)
		http://www.wilyhacker.com (2nd edition of "Firewalls" book)