title: Exim4 - mysql lookup
body: <p>I tried <code>exim4 start</code>, but now I get this error:
  <code>lookup type "mysql" is not available</code>. I installed exim4 with <code>apt-get install exim4</code>. How can I fix this?</p>
  
  <p>Regards,
  Kevin</p>
  
  <p>More information:
  <code>2011-05-23 15:34:14 1QOVGr-0002k2-5D failed to expand "${lookup mysql{SELECT DISTINCT transport FROM mail_transports WHERE transport = '${quote_mysql:$domain}'}}" while checking a list: lookup type "mysql" is not available (not in the binary - check buildtime LOOKUP configuration)
  2011-05-23 15:34:14 1QOVGr-0002k2-5D failed to expand "${lookup mysql{SELECT DISTINCT transport FROM mail_transports WHERE transport = '${quote_mysql:$domain}'}}" while checking a list: lookup type "mysql" is not available (not in the binary - check buildtime LOOKUP configuration)
  </code></p>