You have find out first of all why your server is listed in spamhaus and second make sure that it's not sending spam any more.
When they say it could take 2 hours you don't have to count on this. There are other anti-spam sites that use spamhaus and they have to be updated also.
Quote:
do you have any idea how to block them in RHEL4?
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I'm not sure what you mean.
If you want to stop spammers using your server, you should tell us more info about your mail server.
To check if your server is an open relay go
here