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Re: This is a testmail!

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On 2024-07-04 at 12:59, Thomas Hochstein wrote:

> Hans wrote:
> 
>> Now I got my last mail back with the spam tag!
> 
> That's very surprising.
> 
>> X-Spam-Flag: YES
>> X-SPAM-FACTOR: DKIM
>> Authentication-Results: mail39c50.megamailservers.eu;
>>  dkim=fail reason="signature verification failed" (1024-bit key)
>>  header.d=megamailservers.eu header.i=@megamailservers.eu header.b="QLjumGn/"
> 
> I have absolutely no idea where that spam flag may be coming from.
> It's a mystery.

Perhaps even more interestingly, I see the following, in the
ARC-Authentication-Results header in three mails from Hans in this
thread. (This is not the same as the Authentication-Results header, such
as you quoted, of which there appear to be four in each mail.)


The one which was sent as a reply to my mail has:

>> dkim=pass (1024-bit rsa key sha256) header.d=megamailservers.eu
>> header.i=@megamailservers.eu header.b=QOWbQzHX header.a=rsa-sha256
>> header.s=maildub

The one with the [SOLVED] tag, which was a reply to the previous, has:

>> dkim=fail (message has been altered, 1024-bit rsa key sha256)
>> header.d=megamailservers.eu header.i=@megamailservers.eu
>> header.b=QLjumGn/ header.a=rsa-sha256 header.s=maildub

The one you were replying to has:

>> dkim=fail (message has been altered, 1024-bit rsa key sha256)
>> header.d=megamailservers.eu header.i=@megamailservers.eu
>> header.b=r8P8m4Og header.a=rsa-sha256 header.s=maildub

Perhaps interestingly (or perhaps not), that last one appears to be
multipart MIME (one part with HTML and one part plain-text), whereas the
other two appear to be plain-text-only.

(I am not entirely certain which mail is the one from which Hans quoted
a set of headers. Those headers include a Subject: line with the
[SOLVED] tag, of which I've received only one message thus far via the
list in this thread; however, the headers in that mail as I received it
do not appear to *remotely* match the ones Hans quoted, enough so that I
am not confident of them being the same message. If they are, then that
might narrow down the places where the failure could be being
introduced.)


So we have three at least visible scenarios in just this thread: plain
text with DKIM pass, plain text with DKIM fail, and multipart MIME with
DKIM fail.

Hans, are you certain you composed those three messages the same way,
using the same interface of the same program, and sent them the same
way?

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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Thread

This is a testmail! Hans <hans.ullrich@loop.de> - 2024-07-04 13:20 +0200
  Re: This is a testmail! The Wanderer <wanderer@fastmail.fm> - 2024-07-04 13:30 +0200
    Re: This is a testmail! Hans <hans.ullrich@loop.de> - 2024-07-04 14:00 +0200
      [SOLVED] Re: This is a testmail! Hans <hans.ullrich@loop.de> - 2024-07-04 14:10 +0200
  Re: This is a testmail! CToID <funk443@yahoo.com.tw> - 2024-07-04 13:50 +0200
  Re: This is a testmail! Roger Price <roger@rogerprice.org> - 2024-07-04 14:10 +0200
    Re: This is a testmail! Roger Price <roger@rogerprice.org> - 2024-07-04 14:30 +0200
    Re: This is a testmail! Hans <hans.ullrich@loop.de> - 2024-07-04 14:30 +0200
      Re: This is a testmail! Thomas Hochstein <thh@thh.name> - 2024-07-04 19:20 +0200
        Re: This is a testmail! The Wanderer <wanderer@fastmail.fm> - 2024-07-04 21:00 +0200
          Re: This is a testmail! Hans <hans.ullrich@loop.de> - 2024-07-04 21:30 +0200
            Re: This is a testmail! The Wanderer <wanderer@fastmail.fm> - 2024-07-04 21:40 +0200
              Testmail_3: Reply to one of the mails from The Wanderer Hans <hans.ullrich@loop.de> - 2024-07-04 22:10 +0200
                Re: Testmail_3: Reply to one of the mails from The Wanderer The Wanderer <wanderer@fastmail.fm> - 2024-07-04 22:20 +0200
                Re: Testmail_3: Reply to one of the mails from The Wanderer The Wanderer <wanderer@fastmail.fm> - 2024-07-04 22:20 +0200
                Re: Testmail_3: Reply to one of the mails from The Wanderer Hans <hans.ullrich@loop.de> - 2024-07-04 22:30 +0200
      Re: This is a testmail! Detlef Vollmann <dv@vollmann.ch> - 2024-07-04 23:00 +0200
        Re: This is a testmail! Jeffrey Walton <noloader@gmail.com> - 2024-07-04 23:20 +0200
        Re: This is a testmail! Jeff Pang <jeff@simplemail.co.in> - 2024-07-05 00:30 +0200

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