I added my professional email to my gmail account as POP3 and set it as default for sending emails. Strangely, when sending emails to other emails like hotmail, or even by using tools like mail-tester or mailgenius, for each of them I see in headers something like that :
Gmail to Hotmail
Received: from server1 by server2 with esmtps
Received: from google-server by server2
Received: by google-server
But somehow, when I send an email to another gmail account, the first "Received" is different…
Gmail to Gmail
Received: from server2 by server2 with LMTP id wGSgNXg5bGIpwQEAIcWi0g
Received: from google-server by server2
Received: by google-server
Notice esmtps was replaced by LMTP with some ID, and server1 is not there anymore.
How is this possible and how can I fix this? I need that server1 for SPF check.
More detailed – Gmail to 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)
More detailed – Gmail to 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)
Best Answer
The esmtps is a secure version of the extended smtp protocol, the LMTP protocol you're seeing in the second request is because that request is more local (e.g., from the same server).
You probably wouldn't ever see that esmtps if its not even leaving the host.
Some more information about the situation may help, ie, sending from hotmail to gmail got this or from gmail to gmail got this. :)
I appreciate the edit to the question, but I am not sure if that helps. The sources haven't really changed, and I am not sure that this is the true header.
Sources: