On a perfectly configured server, all information should lead to the same host. Additionally, your IP address will be localized.
Spf
The Sender Policy Framework (SPF) checks if the selected server has permission to send from the selected domain.
Header
An email’s header contains all pertinent information. This checks if data have been duplicated.
dkim
Domain Keys Identified Mail (DKIM) is an email authentication method which acts as a quality seal. This allows easy detection of spoof addresses.
Reputation
Calculated from the points of the “sender” rubric. This also checks if the email address is already on a blacklist.
Envelope / Sender
Checks the email’s originator by directly searching the mail server for information.
From
The email address the recipient sees in their email header. In most cases this differs from the originating address.
List Unsubscribe
Is there an option for the recipient to unsubscribe from receiving the email?
dmarc
Domain-based Message Authentication, Reporting and Conformance (DMARC) uncovers DKIM and SPF errors. That’s why it is mandatory that envelope/sender, from, DKIM and SPF info match.
esp
If known, this will list the Email Service Provider used, e.g. our own, emailsocket.
