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+======Spam Filter Rules: StartDNSBL======
+^Statement  |StartDNSBL |
+^Version  |2.2.1+ |
+^Purpose  |Begins an asynchronous DNS blacklist lookup in advance of the result being required in a subsequent [[spamrules_statement_dnsbl|DNSBL]] statement |
+The **StartDNSBL** statement requires a hostname and DNSBL zone, in the format
+  StartDNSBL <hostname> <DNSBL zone>
+The DNS blacklist lookup begins immediately, but the script is allowed to continue. When the **DNSBL** statement is reached, the script will get the result of the corresponding **StartDNSBL** statement. If the DNS blacklist lookup is still in progress, it will allow the lookup to complete, before returning the result.
+=====Example=====
+<code>
+StartDNSBL ${SenderIP} sbl.spamhaus.org
+# Continue with the rest of the script, whilst also running the DNS blacklist lookup
+# By the time the script reaches the DNSBL statement, the lookup should either be fully or partially completed.
+DNSBL ${SenderIP} sbl.spamhaus.org dnsresult
+</code>

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