Don't the Death Eaters know that Snape's a spy?

[theultimatesen]

No: HPFGUIDX 106612

Jenn wrote:
At the end of Goblet of Fire, Voldemort summons the Death Eaters.  
They form a circle, and, while he doesn't mention him by name, 
Voldemort indicates that one of the six who are missing has left him 
forever and will, of course, be killed.  Wouldn't Voldemort have 
told the remaining Death Eaters who it is who has left his service 
forever?  Why hasn't an attempt been made on Snape's life?  Snape 
admits to Harry that it is his job to know what Voldemort is telling 
his Death Eaters (Occlumency lesson, Order of the Phoenix) - are the 
Death Eaters feeding him bad information?

Jen

Me:
First off, welcome aboard Jenn! I thought something alone the same 
lines last night while listening to OOTP on tape. I don't have my 
book on me right now, my friend borrowed it, so I'm going to try to 
go by memory here. I BELIEVE it's the scene at Grimmauld Place during 
Christmas break where Snape comes to talk to Harry about the 
Occlumency lessons. (That general area!) When Snape & Sirius 
are "going at each other" so to speak, I thought it was odd that 
Snape mentioned Lucius Malfoy recognizing Sirius at the platform. It 
seems to me as if Snape & Malfoy are still kind of chummy to some 
degree (whether it's real or a front). I mean, how else would Snape 
know Lucius recognized him?

(Carol, I guess this sort of ties into our discussion off list)

The whole thing really made me wonder about how Snape's really 
pulling it off. For one, he's head of Slytherin which means most of 
the kids in his house have/had parents who were Co-Death Eaters with 
Snape. Like I mentioned to Carol, I wondered if somehow Snape was 
*not* one of the 3 DE's Voldemort mentions in his GoF speech. For 
two, he seems to be... I don't know exactly how to put it... maybe 
partial to Draco (for lack of a better term) by never punishing him 
for the things HE'S pulled in class and in the corridors (The nice 
little teeth incident resulting in Hermione's newly fixed pearly 
whites). It *almost* seems to me as if he might be turning the other 
cheek (as opposed to showing favoritism) because Draco is a son of a 
friend. I really would like to know how he's managing to work for 
Dumblydore's side yet ... (I know it's not canon but the things we do 
know of... a couple examples I mentioned) he's still kind of friendly 
with the other side. I know this is an incomplete thought and I 
intend on persuing it further once I get home, but my husband is 
making a fuss about me getting ready to go. 

Sen