======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>