advanced anti spam
make it easier for people to decide what is considered spam. say I get something from Jo bob about a year supply of gold stickers. since this is spam. use a check box to declare it as spam. then instead of going to a spam folder it gets automatically deleted and blocked until the user unchecks it. this way it gets rid of the spam folder. plus an option to receive emails from only people in your contacts would be nice. in other words put the user in control.
also, for spam say there is enough submissions from a specific root directory. then you guys slap a ban on it. so no one else gets bothered by it.
spam gets deleted forever, increases security and puts the user in full control.