[{"data":1,"prerenderedAt":42},["ShallowReactive",2],{"$f35gom7d7na7in":3},{"title":4,"seoTitle":5,"description":6,"route":7,"kind":8,"toolKey":9,"intro":10,"indexable":11,"sections":12,"related":39},"SPF 檢查","SPF 檢查 | nslookup.online","檢查 SPF TXT、語法、CIDR 與 include\u002Fredirect 相依，顯示證據與靜態分析限制。","\u002Fzh-tw\u002Fspf-checker\u002F","tool","spf","讀取 SPF 語法與 DNS 相依，不虛構寄件授權結論。",true,[13,20,26,32],{"id":14,"title":15,"paragraphs":16,"code":19},"read-answer","從寄件網域開始",[17,18],"輸入要檢查的網域，工具從 TXT 選 v=spf1 並保留資源記錄邊界。多筆候選是設定問題，不能合成一筆。","僅做靜態設定分析，不接收寄件 IP、MAIL FROM、HELO，不能判斷特定主機獲授權與否。","example.com. 300 IN TXT \"v=spf1 include:mail.example -all\"\n\n文件範例 — 非即時 DNS 回應",{"id":21,"title":22,"paragraphs":23},"dependencies","追蹤 include 與 redirect",[24,25],"沿字面網域追蹤相依、辨識明顯迴圈並保留證據。存在 all 時不套用 redirect。","總請求、深度及時間受產品上限約束。達上限標示未完成，不宣稱成功或違反協定。",{"id":27,"title":28,"paragraphs":29},"limits","查詢項目不同於瀏覽器請求",[30,31],"RFC 7208 限制實際評估路徑觸發 DNS 的項目，HTTP 次數與靜態相依圖總數是不同指標。","靜態圖可能含實際未走的分支，超過十僅提示風險，不斷言必然 PermError。空查詢及位址比對需寄件情境。",{"id":33,"title":34,"paragraphs":35},"questions","理解 all 與未支援路徑",[36,37,38],"-all 是未匹配者 fail 意圖，~all 為 softfail 不必然錯誤，+all 允許所有寄件方，均不保證進入收件匣。","檢查 IP CIDR 與常見機制、修飾詞。複雜巨集標示未完成，不虛構參數；ptr 不受推薦，也不模擬寄件 IP 評估。","不自動展平 SPF 或產生可直接發布的設定。變更前保留原記錄並在實際服務驗證。",[40,41],"\u002F","\u002Fguides\u002Fnslookup-command\u002F",1792661399404]