A bunch of people have (correctly, I think) pointed out that more recent LinkedIn emails come from them directly. I have seen emails as recent as 2012 sent from user addresses: http://imgur.com/gallery/fapPDhZ/new (sorry for the manic smudging).
Anyhow, assuming these are anomalous, and that LinkedIn has generally moved to sending emails properly, I still stand by my decision to close down my account. I haven't gotten anything useful out of it and I have been consistently annoyed by it. Not devastating, but like I said, annoying. If you use it and love it then great! I hope LinkedIn keeps on improving and becomes/stays (your option) a great company. But if you're not getting anything out of it, then I think it would behoove you to think twice about why you maintain the account, and if it's nothing but annoying then at least consider getting rid of it.