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

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