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Cisco Cisco Email Security Appliance C190 User Guide

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Cisco AsyncOS 9.1 for Email 사용 설명서
 
9 장     메시지 필터를 사용하여 이메일 정책 적용
  메시지 필터 예
루핑 탐지 필터
이 필터는 메일 루프를 유발하는 원인을 탐지, 중지 및 판단하는 데 사용됩니다. 이 필터는 Exchange 
서버 또는 기타 서버에서 구성 문제를 판단하는 데 유용합니다.
참고
기본적으로, AsyncOS는 자동으로 메일 루프를 탐지하고 100개의 루프 후에 메시지를 삭제합니다. 
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"); }