Managed File Transfer

JSCAPE Secure FTP Server is a great secure file transfer server that has given tons of options for businesses and is something I would suggest you look into.

Description from their site:

JSCAPE Secure FTP Server is a platform independent managed file transfer server that supports FTP, secure FTP (FTP over SSL), HTTP and HTTPS protocols. JSCAPE Secure FTP Server greatly simplifies the process of securely exchanging data with trading partners and automation of file transfer processes, resulting in increased productivity and immediate return on investment. Platform independent Java based installers are available for Windows, Linux, Solaris ,UNIX, and Mac OS X platforms.