instead of fixing things that don't need fixing, how about you put an effort into stopping junkmail, fix block and delete so it works and actually blocks senders and especially senders that say no sender address, there is thousands of scammers that send emails out with no sender address, time you became smarter than the scammers and spammers and block these senders and the servers they use, start protecting people and help keep your users safe by putting proper proticols in place so people can block these junkmail senders and servers they use, its not rocket science it just comon sense so how about you get some and use it yahoo.