I don't know about Yahoo, but a years ago there used to be a bug with MSN that basically blocking just made you appear offline rather than stopping messages so they could still send a message and it would pop-up you would just stay at offline status.
I dunno about Yahoo, but a years ago there used to be a bug with MSN that basically blocking just made you appear offline rather than stopping messages so they could still send a message and it would pop-up you would just stay at offline status.
I think that's what Yahoo did. Because even though I had him "blocked" it also had an ignore option when I received his messages