Autosend is a file server based on communications by email. People make requests by sending a mail to the server email address, the subject of the mail is the name of the requested file. Then the server sends back the file as attachment (download). It can also receive files sent by others (upload) or answer to some commands. It adds a lot of features to let you control who can use your server and what files you want to share. Just like a FTP server but with all commnications done via email. This lets you go through firewalls and proxies.