Right, basically, there's this random person who seems to send me messages sometimes when I sign in. Like this.
They are not on my contact list, so I cannot block them. And I don't want to add them, do I? All I can do is report as compromised, which isn't what I want to do here. So what is the best way of "blocking" them (in quotes, since blocking doesn't really do what it used to any more...)?