My apologies for this Tim. We've deleted the user and blocked him entirely. We'll take some further steps to prevent this happening again.
I am still getting these spams.
How do i unsubscribe to momentum?
I'm really sorry to hear that you are still seeing this. The culprit was able to make 15 posts before we blocked him. It may be that emails have been delayed in reaching you from this because we haven't seen any further posts: Momentum
I will contact you directly about your unsubscribe request.