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is exim attempting to relay ???

Recently, I am getting emails bounced back to me from my mail gateway.
Strangely, the attempted outgoing From: is
FETCHMAIL-DAEMON@bragi.private.network ?!?!

The entire bounce is here:


I do not claim to know much about this process.

However, correct me if I'm wrong, it looks to me that -- initially --
fetchmail gets an email message from one of my many remote mail servers,
and passes it off to exim for local processing.

The To: header is mangled, and noted, and 550 is returned.

Then, somehow -- this is the part that I do not understand, and that I
want to *STOP* happening -- FETCHMAIL-DAEMON@bragi.private.network
attempts to send an email -- containing this 550 error -- to some
address unknown to me.  Note: the URL is only one (1) of many
_different_ examples I am seeing.

Of course, the remote SMTP server rejects
FETCHMAIL-DAEMON@bragi.private.network: Domain not found, and
eventually, I receive the error that the bounce bounced!

So, I want to know several things:

[1] Am I correct on the process as evident from the URL?

[2] What process steps am I missing and/or misunderstanding?

[3] How can I prevent these attempts to send these messages From:

[4] Is exim the culprit?  Need I configure it differently?

   # sudo exim -bV
   Exim version 3.36 #1 built 24-Jul-2003 23:00:48
   Copyright (c) University of Cambridge 2002

What do you think?

Best Regards,

mds resource
Dare to fix things before they break . . .
Our capacity for understanding is inversely proportional to how much
we think we know.  The more I know, the more I know I don't know . . .

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