This probe connects to a FirstClass mail server that defaults to listening on port 510. It sends two carriage returns, and expects to receive a banner; the default contains "FirstClass System".
</description>
<parameters>
"banner" = "FirstClass System"
</parameters>
<script>
CONN #60 (connect timeout in secs)
SEND "\r\r"
MTCH "${banner}"i #+2
DONE OKAY
DONE ALRM "[FirstClass Server] Did not find '${banner}' in the banner."