smtp_rcptto.xml

<?xml version='1.0' encoding='UTF-8'?>
<fingerprints protocol="smtp" database_type="service">
  <!--
   <fingerprint pattern="501[ -]Invalid domain *">
      <description> Description here</description>
      <param pos="0" name="service.vendor" value="Global Technology Associates"/>
      <param pos="0" name="service.family" value="GNAT Box"/>
      <param pos="0" name="service.product" value="GNAT Box"/>
   </fingerprint>

   <fingerprint pattern="550[ -]System error\. *">
      <description>and here</description>
      <param pos="0" name="service.vendor" value="Global Technology Associates"/>
      <param pos="0" name="service.family" value="GNAT Box"/>
      <param pos="0" name="service.product" value="GNAT Box"/>
   </fingerprint>

   -->

  <fingerprint pattern="550[ -]not local host .*, not a gateway *">
    <description>550 not local host foo.bar, not a gateway</description>
    <param pos="0" name="service.vendor" value="Ipswitch"/>
    <param pos="0" name="service.family" value="IMail Server"/>
    <param pos="0" name="service.product" value="IMail Server"/>
    <param pos="0" name="service.cpe23" value="cpe:/a:ipswitch:imail_server:-"/>
  </fingerprint>

</fingerprints>