Ok. Here we go. What if a service exist that can...

- send files of unlimited size?
- recipient/sender only need e-mail program & web browser
- no additional software
- Resend & Reget for resuming after link failure at last sent byte
- auto-notification of recipient
- auto-deletion after download or expiration date
- sending to multiple recipients need storage on the server only once
- HTTP service (no firewall-tunnels)
- open source
- support streams
It exists:
http://fex.rus.uni-stuttgart.de/