This is what I got back.
YouSendIt: Online File Sharing and collaboration with FTP Replacement - Send Large Files and Email Attachments with Managed File Transfer Solution
... We're sorry but your submission did not complete properly, please try again. If this problem persists, please contact Customer Service...I'd been getting spam from them. Looks like they're goners.
There's a lesson here. Be very careful what you sign up for. There may be no way out ...