I'm not sure wether or not this is the right place to post this, but I've clicked on the feedback is welcomed link on the Careers Stackoverflow site and arrived here.
I have a Careers profile which I don't really use. I got messaged by someone (a company) about a position, I chose to ignore the message (don't want to reply). I've read the message on the website, and it has been marked as read.
Following that, I get a notification weekly or once every two weeks titled:
Reminder: X is waiting to hear from you - Stack Overflow Careers 2.0.
I've checked several times, and even went out of my way to select the message and click the mark as read button, but the emails still come.
This must be a bug.