Musescore Flooding Inbox with 'Happy Anniversary' email.

Just thought I'd note that over the past day and a bit Musescore has been spamming my email with the exact same promotional email. The email says 'Happy Anniversary', and I've received it 30+ times in the past 24 hours. Unsubscribing hasn't done anything. I don't really want to block the email and report it as spam, but I don't know what else to do.