From: "Geo" 

You would think so but it depends, dns uses cache so if the others are
cached but that address entry is not cached when the blacklist is
unreachable then it could affect just the users who's address isn't cached.

Geo.

"Glenn Meadows"  wrote in message
news:42ac6193$1{at}w3.nls.net...
> Yes, using 2, but I do not know the answers to the other questions though.
> IF that were a problem, would it not affect all users?  Even when NOT
> sending mail at that point?

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