I've had to take Spamhaus out of our DNS blacklists.  I was not previously
aware that they had limits on free use.  We exceed those limits.  I think
their price is a bit steep, though, so I'm looking for effective DNS
blacklists to put in our connection checks.  
I have Spamcop and CBL now.
Any other suggestions?
In Imail we use DNS blacklists on the connection checks, then we also use
Declude with Message Sniffer.

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