Gmail 是否會刪除標題中的“已接收”？

我將我的專業電子郵件作為 POP3 添加到我的 gmail 帳戶，並將其設置為預設發送電子郵件。奇怪的是，當向 hotmail 等其他電子郵件發送電子郵件時，甚至使用 mail-tester 或 mailgenius 之類的工具時，我在每個郵件的標題中都看到了類似的內容：

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“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 已被帶有一些 ID 的 LMTP 替換，並且 server1 不再存在。

這怎麼可能，我該如何解決？我需要那個 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 <professional@domain.com>)
   id 1nk4co-0007F6-CK
   for private@hotmail.com; 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 <professional@domain.com>)
   id 1nk4c9-00BNxm-QH
   for private@hotmail.com; Thu, 28 Apr 2022 09:55:23 -0400
Received: by mail-vs1-f52.google.com with SMTP id i186so4660856vsc.9
   for <private@hotmail.com>; 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 <professional_first@domain.com>) 
   for <professional_second@domain.com>; 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 <professional_first@domain.com>) id 1nkW67-000XKe-6M 
   for professional_second@domain.com; Fri, 29 Apr 2022 15:16:08 -0400
Received: by mail-ed1-f52.google.com with SMTP id k27so10117156edk.4
   for <professional_second@domain.com>; Fri, 29 Apr 2022 12:16:08 -0700 (PDT)

esmtps 是擴展 smtp 協議的安全版本，您在第二個請求中看到的 LMTP 協議是因為該請求更本地化（例如，來自同一伺服器）。

如果它甚至沒有離開主機，你可能永遠不會看到那個 esmtps。

有關這種情況的更多資訊可能會有​​所幫助，即從 hotmail 發送到 gmail 得到這個或從 gmail 到 gmail 得到這個。:)

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

引用自：https://serverfault.com/questions/1099834