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.
That's probably just a narrow situation where the sender knows your email address and is sending a message from within LinkedIn. It's not that LinkedIn has modified its email sending behavior in the past year or 2. I am sure you can confirm for us that the dozens or 100s of other emails you have received "from" LinkedIn are actually being send "From:" LinkedIn?
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.