I’ve received three of these babies today and reported each to LinkedIn.
From: LinkedIn Reminder (firstname.lastname@example.org) (Note: make note of the sender’s address)
Subject: LinkedIn Reminder sent you a direct notification
LinkedIn Reminder has sent you a message
Random fake LinkedIn URL Note: URL in message deleted by me
When in doubt, don’t click the link. Open a new tab or window and go directly to LinkedIn.com and log in.