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Gmail 是否会删除邮件头中的“已收到”字样？

tag-icon • tag-icon gmail pop3
Gmail 是否会删除邮件头中的“已收到”字样？

我将我的专业电子邮件作为 POP3 添加到我的 gmail 帐户，并将其设置为发送电子邮件的默认方式。奇怪的是，当我向 hotmail 等其他电子邮件发送电子邮件时，或者甚至通过使用 mail-tester 或 mailgenius 等工具发送电子邮件时，我在每封电子邮件的标题中都会看到类似这样的内容：

Gmail 至 Hotmail

Received: from server1 by server2 with esmtps
Received: from google-server by server2
Received: by google-server

但不知何故，当我向另一个 Gmail 帐户发送电子邮件时，第一个“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

请注意，esmtps 已被具有某些 ID 的 LMTP 取代，并且 server1 不再存在。

这怎么可能？我该如何解决？我需要 server1 进行 SPF 检查。

更详细 - Gmail 至 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)

更详细 - Gmail 至 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 是扩展 smtp 协议的安全版本，您在第二个请求中看到的 LMTP 协议是因为该请求更加本地化（例如，来自同一台服务器）。

如果它甚至没有离开主机，您可能永远不会看到 esmtps。

有关该情况的更多信息可能会有所帮助，例如，从 hotmail 发送到 gmail 得到此信息或从 gmail 发送到 gmail 得到此信息。:)

我很感谢对问题的修改，但我不确定这是否有帮助。来源并没有真正改变，我不确定这是真正的标题。

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)

资料来源：

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

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