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Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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Cisco AsyncOS 9.0 for Email User Guide
 
Chapter 9      Using Message Filters to Enforce Email Policies
  Message Filter Examples
Detect Looping Filter
This filter is used to detect, stop, and determine what is causing, a mail loop. This filter can help 
determine a configuration issue on the Exchange server or elsewhere.
Note
By default, AsyncOS automatically detects mail loops and will drop messages after 100 loops. 
External_Loop_Count:
if (header("X-ExtLoop1")) {
  if (header("X-ExtLoopCount2")) {
    if (header("X-ExtLoopCount3")) {
      if (header("X-ExtLoopCount4")) {
        if (header("X-ExtLoopCount5")) {
          if (header("X-ExtLoopCount6")) {
            if (header("X-ExtLoopCount7")) {
              if (header("X-ExtLoopCount8")) {
                if (header("X-ExtLoopCount9")) {
                   notify ('joe@example.com');
                   drop();
                }
              else {insert-header("X-ExtLoopCount9", "from
                   $RemoteIP");}}
            else {insert-header("X-ExtLoopCount8", "from $RemoteIP");}}
          else {insert-header("X-ExtLoopCount7", "from $RemoteIP");}}
        else {insert-header("X-ExtLoopCount6", "from $RemoteIP");}}
      else {insert-header("X-ExtLoopCount5", "from $RemoteIP");}}
    else {insert-header("X-ExtLoopCount4", "from $RemoteIP");}}
  else {insert-header("X-ExtLoopCount3", "from $RemoteIP");}}
else {insert-header("X-ExtLoopCount2", "from $RemoteIP");}}
else {insert-header("X-ExtLoop1", "1"); }