Missing Security Authentication Headers in Email

Hi all,

I have two copies of the same email.

One copy is showing me the authentication results in the email header, e.g dmarc/spf/dkim results.

The other copy is not showing me this.

The email has come the same sender, who forwarded it as a .msg attachment.

Any idea what might be the reason for the headers not aligning?

Thanks in advance,

urban

 

They got routed via different mail servers, right? I mean, one went from the sender to their email server, and then back. And the other went from the sender to their email server, from there (perhaps via other servers) to your email server, and then to you. So it'd be surprising if the headers matched.

It might point to a misconfiguration in the server that's not doing authentication right.

 

Forwarding means e-mail is sent from another SMTP server. This means headers are not valid for that action, so they are removed or ignored.

 

Well, op wrote:

I doubt that servers would be messing with contents of attachments.

https://www.adviksoft.com/blog/extract-attachments-from-msg-files-without-outlook-installation/

 

I wouldn't be that sure. I think that a lot of SMTP servers interpret attachments as part of message and only e-mail clients such as Thunderbird or webmails extract attachments from the message.