How can I use rspamd to detect spam messages ?

To use rspamd to detect spam messages you can use the following code in your filter:

 my ($hits, $req, $names, $report, $action, $is_spam) = rspamd_check();
 md_syslog("Warning", "Action: $action, Spam: $is_spam, Names: $names");
 if ($is_spam eq "true") {
   action_change_header("X-Spam-Score", "$hits/$req $names");
   md_syslog("Warning", "Action: $action");
   md_graphdefang_log('spam', $hits, $RelayAddr);
 } else {
   # Delete any existing X-Spam-Score header?
   action_delete_header("X-Spam-Score");
 }