Autosend is file server based on e-mails. It lets you share files through regular email. Downloads and uploads are possible. Just like a FTP server but by mail. Many security features: members list, ignore list, extensions filters. Convenient features: lists sent as html, dial-up if necessary, all texts can be customized, built-in SMTP server, preview pictures in the list of shared files, easy way to send the list of files.
More info:
hxxp://welcome.to/autosend