我將我的專業電子郵件作為 POP3 新增到我的 Gmail 帳戶,並將其設定為發送電子郵件的預設電子郵件。奇怪的是,當向其他電子郵件(如 hotmail)發送電子郵件時,甚至使用 mail-tester 或 mailgenius 等工具時,對於每個電子郵件,我都會在標題中看到類似的內容:
Gmail 到 Hotmail
Received: from server1 by server2 with esmtps
Received: from google-server by server2
Received: by google-server
但不知何故,當我向另一個 gmail 帳戶發送電子郵件時,第一個「已收到」是不同的...
Gmail 到 Gmail
Received: from server2 by server2 with LMTP id wGSgNXg5bGIpwQEAIcWi0g
Received: from google-server by server2
Received: by google-server
請注意,esmtps 已被帶有某些 ID 的 LMTP 替換,並且 server1 不再存在。
這怎麼可能?我需要該 server1 進行 SPF 檢查。
更詳細 - Gmail 到 Hotmail
Received: from nwpro1.fcomet.com ([172.104.22.223])
by mx36.antispamcloud.com with esmtps (TLSv1.3:TLS_AES_256_GCM_SHA384:256)
(Exim 4.92)
(envelope-from <[email protected]>)
id 1nk4co-0007F6-CK
for [email protected]; Thu, 28 Apr 2022 15:56:08 +0200
Received: from mail-vs1-f52.google.com ([209.85.217.52]:42929)
by nwpro1.fcomet.com with esmtpsa (TLS1.3) tls TLS_AES_128_GCM_SHA256
(Exim 4.94.2)
(envelope-from <[email protected]>)
id 1nk4c9-00BNxm-QH
for [email protected]; Thu, 28 Apr 2022 09:55:23 -0400
Received: by mail-vs1-f52.google.com with SMTP id i186so4660856vsc.9
for <[email protected]>; Thu, 28 Apr 2022 06:55:23 -0700 (PDT)
更詳細 - Gmail 到 Gmail
Received: from nwpro1.fcomet.com
by nwpro1.fcomet.com with LMTP id wGSgNXg5bGIpwQEAIcWi0g
(envelope-from <[email protected]>)
for <[email protected]>; Fri, 29 Apr 2022 15:16:08 -0400
Received: from mail-ed1-f52.google.com ([209.85.208.52]:37606)
by nwpro1.fcomet.com with esmtpsa (TLS1.3) tls TLS_AES_128_GCM_SHA256
(Exim 4.94.2)
(envelope-from <[email protected]>) id 1nkW67-000XKe-6M
for [email protected]; Fri, 29 Apr 2022 15:16:08 -0400
Received: by mail-ed1-f52.google.com with SMTP id k27so10117156edk.4
for <[email protected]>; Fri, 29 Apr 2022 12:16:08 -0700 (PDT)
答案1
esmtps 是擴展 smtp 協定的安全版本,您在第二個請求中看到的 LMTP 協定是因為該請求更加本地化(例如,來自同一台伺服器)。
如果 esmtps 甚至沒有離開主機,您可能永遠不會看到它。
有關該情況的更多資訊可能會有所幫助,即從 hotmail 發送到 gmail 得到了此資訊或從 gmail 發送到 gmail 得到了此資訊。 :)
我很欣賞對問題的編輯,但我不確定這是否有幫助。來源並沒有真正改變,我不確定這是否是真正的標題。
All the headers I found are like this:
Received: by filterdrecv-75d94df84d-wmwh2 with SMTP id filterdrecv-75d94df84d-wmwh2-1-626C6700-1A
2022-04-29 22:30:24.062932892 +0000 UTC m=+1989919.691835974
Received: from MjIyOTcyNTI (unknown)
資料來源:
ESMTP (minus s, as that is ssl)
https://help.returnpath.com/hc/en-us/articles/220564347-What-is-Extended-Simple-Mail-Transfer-Protocol-ESMTP-
SMTP
https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol
LMTP
https://en.wikipedia.org/wiki/Local_Mail_Transfer_Protocol