Email Headers - Source IP

Ross Donnelly <[email protected]>
Newsgroups gmane.mail.squirrelmail.user
Message-ID <CAMZgK6-9jB05wBPcsvJY4gSnThLi48xjb4+4wNHVYvjKXY99Vw@mail.gmail.com>
Good afternoon,

I wonder if someone could assist me with how SquirrelMail generates it
email headers when sending emails.

The first header entry shows the source IP:
Received: from 1.2.3.4 ([1.2.3.4]) (SquirrelMail authenticated user
[email protected]) by squirrelmail.com with HTTP:

Does this relate to the IP address of the SquirrelMail server, the IMAP
server, or the end user who sent the email?

Regards,
Ross
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