使用 exim4 添加 X-Spam-Flag

我是 exim4 的新手。我有這個配置：

.ifdef SA_ENABLE
       warn
           !authenticated = *
           hosts = !127.0.0.1/24
           condition = ${if < {$message_size}{1K}}
           spam       = SA_SPAMD_USER:true
           add_header = X-Spam_score: $spam_score\n\
                  X-Spam_score_int: $spam_score_int\n\
                  X-Spam_bar: $spam_bar\n\
                  X-Spam_report: $spam_report

       warn
           !authenticated = *
           hosts = !+relay_from_hosts
           spam       = SA_SPAMD_USER:true/defer_ok
           add_header = X-Spam_score: $spam_score\n\
                   X-Spam_score_int: $spam_score_int\n\
                   X-Spam_bar: $spam_bar\n\
                   X-Spam_report: $spam_report
           set acl_m4 = $spam_score_int
           condition = ${if and{{<{$message_size}{100K}}{<{$acl_m4}{SA_SCORE_REJECT}}} {yes}{no}}
           logwrite = From $sender_address to $recipients X-Spam_score: $acl_m4.

       deny
           condition = ${if and{{>{$message_size}{10K}}{!eq{$acl_m4}{}}{>{$acl_m4}{SA_SCORE_REJECT}}} {yes}{no}}
           message = Content analisis tool detect spam (from $sender_address to $recipients). Contact SA_ABUSE_ADDR.
.endif

如果分數超過/低於某個值，我如何調整添加 X-Spam-Flag（是或否），如果超過另一個值則拒絕。（目前 SA_SCORE_REJECT = 50）

如果我想強制執行兩個單獨條件的 AND，我發現將它們寫成兩個單獨的條件子句更清楚。我認為這會起作用：

# Define constants
SA_MESSAGE_SIZE=100K
SA_SCORE_FLAG=50
SA_SCORE_REJECT=100

和

.ifdef SA_ENABLE
   warn
       !authenticated = *
       hosts = !127.0.0.0/8 : !+relay_from_hosts
       condition = ${if <{$message_size}{SA_MESSAGE_SIZE}}
       spam       = SA_SPAMD_USER:true
       set acl_m4 = $spam_score_int
       add_header = X-Spam_score: $spam_score\n\
              X-Spam_score_int: $spam_score_int\n\
              X-Spam_bar: $spam_bar\n\
              X-Spam_report: $spam_report

   warn
       !authenticated = *
       hosts = !127.0.0.0/8 : !+relay_from_hosts
       condition = ${if <{$message_size}{SA_MESSAGE_SIZE}}
       condition = ${if >{$acl_m4}{SA_SCORE_FLAG}}
       add_header = X-Spam-Flag: YES
       logwrite = From $sender_address to $recipients X-Spam_score: $acl_m4.

# Reject spam messages with score*10 over SA_SCORE_REJECT=100
   deny
       !authenticated = *
       hosts = !127.0.0.0/8 : !+relay_from_hosts
       message = Content analysis tool detect spam (from $sender_address to $recipients). Contact SA_ABUSE_ADDR.
       condition = ${if <{$message_size}{SA_MESSAGE_SIZE}}
       condition = ${if >{$acl_m4}{SA_SCORE_REJECT}}
       logwrite = From $sender_address to $recipients spam message was rejected X-Spam_score: $acl_m4. 
.endif

$ spam_score_int=100 is equal $ spam_score=10.0

引用自：https://serverfault.com/questions/851021