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<header> SMTP服務器對域拒絕的響應</header><center> <tt>unknown_address_reject_code</tt> </center> <hr>當客戶端違反<tt>reject_unknown_sender_domain</tt>或<tt>reject_unknown_recipient_domain</tt>限制規則時,此參數指定SMTP服務器響應代碼: <br> <i>拒絕訪問:發件人或收件人電子郵件地址的未知域(沒有DNS A或MX記錄)</i> <br><br>請注意,用於<tt>unknown_address_reject_code</tt>的後綴默認值為代碼450,也用於其他錯誤。 “標準RFC 822”中的此代碼表示“未執行請求的郵件操作:郵箱繁忙或訪問被拒絕”,並要求發件人稍後重試(希望DNS稍後會正確回答)。 <br><p>除非您完全了解RFC 822,否則請勿更改此設置。 </p><hr>