From headers:

 

Received: from BL0GCC02FT014.eop-gcc02.prod.protection.outlook.com

(2a01:111:f400:7d05::209) by CYXPR09CA0010.outlook.office365.com

(2603:10b6:930:d4::15) with Microsoft SMTP Server (version=TLS1_2,

cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6319.25 via Frontend

Transport; Thu, 20 Apr 2023 11:49:06 +0000

Authentication-Results: spf=softfail (sender IP is 63.88.93.251)

smtp.mailfrom=open-xchange.com; dkim=fail (signature did not verify)

header.d=open-xchange.com;dmarc=fail action=oreject

header.from=open-xchange.com;compauth=none reason=452

Received-SPF: SoftFail (protection.outlook.com: domain of transitioning

open-xchange.com discourages use of 63.88.93.251 as permitted sender)

 

From: Aki Tuomi <aki.tuomi@open-xchange.com>
Date: Thursday, April 20, 2023 at 07:49
Subject: [EXTERNAL] Re: Mailing list is being Spam Filtered by O-365

 

On 20/04/2023 14:18 EEST White, Daniel E. (GSFC-770.0)[AEGIS] via dovecot <dovecot@dovecot.org> wrote:

 

 

Is there any chance that SPF and DKIM records could be added to appear in the headers ?

 

The gubba-mint folks are getting extremely medieval about email security.

 

 

Um? Those already are added? Or what do you mean?

 

Aki

 

Wietse Venema gave this answer on the same question on the postfix mailinglist:

"
The list server adds its own DKIM-Signature: on behalf of the domain
postfix.org, AND it adds ARC headers and Authentication-Results:
for the message as received before modiification and redistribution.

However it does NOT remove existing DKIM-Signature: headers that
are no longer matching header and body content.
"

I would guess the same applies for this list.

- Kees.

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