THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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If you have a large ISP or are using large public DNS provider(s) it is recommended you not forward mail-related DNS traffic through their DNS servers (though non-mail DNS traffic from your site shouldn't have problems.) With bind, this means not having any "forwarders" listed. Or, at a minimum, you could create exemptions by defining empty forwarders for DNSBL zones, like this:
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/* Disable forwarding for DNSBL queries */
zone "multi.uribl.com" { type forward; forward first; forwarders {}; };
zone "dnsbl.sorbs.net" { type forward; forward first; forwarders {}; };
zone "combined.njabl.org" { type forward; forward first; forwarders {}; };
zone "activationcode.r.mail-abuse.com" { type forward; forward first; forwarders {}; };
zone "nonconfirm.mail-abuse.com" { type forward; forward first; forwarders {}; };
zone "iadb.isipp.com" { type forward; forward first; forwarders {}; };
zone "bl.spamcop.net" { type forward; forward first; forwarders {}; };
zone "fulldom.rfc-ignorant.org" { type forward; forward first; forwarders {}; };
zone "list.dnswl.org" { type forward; forward first; forwarders {}; };
zone "blackholes.mail-abuse.org" { type forward; forward first; forwarders {}; };
zone "bl.score.senderscore.com" { type forward; forward first; forwarders {}; };
zone "zen.spamhaus.org" { type forward; forward first; forwarders {}; };
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