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Re: Fw: Undelivered Mail Returned to Sender

From: Przemek Klosowski
Subject: Re: Fw: Undelivered Mail Returned to Sender
Date: Fri, 10 Jul 2020 13:04:12 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

On 7/10/20 11:34 AM, chloros wrote:
Hi Markus,

the same thing happened to me on wednesday when I replied to one of the
jsondecode emails. I got the same error:

DreamHost Email Support
<octave-maintainers@gnu.org> (expanded from <maintainers@octave.org>):
host eggs.gnu.org[] said: 550-[SPF] is not
allowed to send mail from gmx.de.

Yet another gmx feature ...

So typically what happens is that either an email listserver or someone's forwarding results in an email that claims to be from you but actually coming from gmx. The email headers specify SPF checks, and the gnu.org MTA obediently verifies them and balks. That's why modern listservers say things like From: listserver.us on behalf of jane@doe.com--the SPF is correct wrt. the actual sender, and yet you can still see who actually originated the email.

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