I used to get past SH's slush readers. Not anymore, it seems. Won't stop me from trying, though.
How do you know? I've always assumed forms meant it didn't get through the first reader, but maybe that's not how they do it.
I've had one personal rejection from SH. I get the feeling my writing isn't literary enough for their tastes, as I'm much more plain spoken than most of the stories they publish. I still send them stuff though, on the off-chance.