If you use Yahoo email and you are one of those people who save every email, it looks like you won't need to empty the trash anytime soon.
Yahoo announced that in May, the company will over unlimited storage capacity.
I can see bumping up the total capacity for users, but saying it will be unlimited seems a bit overboard. I would assume there will still be a limit on file size for an individual attachment per email. Even still, by sending music files, users could quickly attain astronomical mailbox sizes.
I guess that's something Yahoo will have to figure out, eventually.