Dkim

使用 DKIM 和 SPF 鎖定並收到看起來由我們的 DKIM 簽名的電子郵件

  • February 27, 2020

我們收到了這封電子郵件,這絕對是垃圾郵件/欺騙我們的東西(我還沒有設置 DMARC,還沒有完成在另一個為我們發送電子郵件的服務上設置 DKIM)。我不明白他們是如何簽署他們的東西的,所以 gmail 認為它是由 orderlyhealth.com 簽署的

在此處輸入圖像描述

我確實在論壇中粘貼了 DNS TXT 記錄,但 AFAIK,該 DNS 記錄無論如何都可以通過 DNS 查詢公開獲得。我怎樣才能解決這個問題?

我的意思是,我可以生成另一個 DKIM,但這個在 2 天前是全新的。有人知道我們是如何簽名的嗎?

這是更詳細的輸出。我也不確定 s=arc20160816 是什麼?

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只是為了添加更多關於 @Dean 和 @Reinto 發現的關於 Google 為什麼在發件人姓名上實施“通過”資訊的詳細資訊:

根據 DMARC rfc7489,低於 10.5。 互操作性問題

“因為 DMARC 依賴於

$$ SPF $$和/或$$ DKIM $$要實現“通過”,它們的局限性也同樣適用。 當消息由某些中介(例如郵件列表)處理時,會出現額外的 DMARC 約束。傳輸中介通常會導致身份驗證失敗或標識符對齊失去。這些轉換可能符合標準,但仍會阻止 DMARC “通過”。

話雖如此,讓我們回顧一下整個場景:

一條消息從具有拒絕或隔離的 DMARC 策略的域發送到Public Google Group。Google 群組將收到來自原始發件人的郵件,並採用 DMARC 政策(拒絕或隔離)。現在組需要將消息擴展給它的成員(在收到它並檢查哪些成員應該得到它之後)。

郵件將從群組地址擴展到成員,但“發件人”將保持為原始發件人,但“SMTP FROM”(在 Google 方面稱為“返迴路徑”地址)將更改為群組地址.

什麼時候這可能是一個問題?

同樣,如果原始發件人具有 DMARC 以防止垃圾郵件發送者欺騙他們的域。因為當一個群組收到一條消息時,它會更改發件人欄位中的地址,從真正的發件人到群組地址,這在過去導致了很多 DMARC 拒絕。

Google做了什麼來解決這個問題?

為了緩解這種情況,Google 實施了一種變通方法來重寫“發件人”地址以使用本地域,因此 DKIM 現在正在通過 DMARC。

這對群組成員來說是什麼樣的?

“組成員通過以下方式接收來自外部發件人的消息作為’發件人的姓名’:”

即使最終的收件人可能會感到困惑。這是一項必要的功能,以保證從在其域中具有 DMARC 保護的發件人發送到組的消息的傳遞。

最後,正如您所注意到的,這在此處記錄

引用自:https://serverfault.com/questions/1004096