New automatic email from 7cups

A few days ago, I started getting emails from 7cups to let me know that I had a "new message" (because someone wrote to me). It appears in the junk mailbox. I would like to unsubscribe to this particular email without missing other emails from 7cups since all emails are sent from the same address (noreply@email.7cups.com). How could this be done? Thank you.