I only found a multipart/mixed, see below.
I also do not find a Plain Text Mode under HTML Preferences? I am using version 3.44.4-0ubuntu1 of Evolution under Linuxmint 21.1 vera.
Here is one “failed” email, where I have removed (hopefully) all sensitive information (names, addresses etc).
[Edit] I had to remove a base64-encoded image, to get the size under the allowed 32k.
Return-Path: <$$$REMOVED$$$>
Delivered-To: $$$REMOVED$$$
Received: from akilles.oderland.com
by akilles.oderland.com with LMTP
id IOV+DTlswWOpJTMA+O+zbw
(envelope-from <$$$REMOVED$$$>)
for <$$$REMOVED$$$>; Fri, 13 Jan 2023 15:35:37 +0100
Return-path: <$$$REMOVED$$$>
Envelope-to: $$$REMOVED$$$
Delivery-date: Fri, 13 Jan 2023 15:35:37 +0100
Received: from mx1.oderland.com ([91.201.60.244]:48304) by
akilles.oderland.com with esmtps (TLS1.2) tls
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from
<$$$REMOVED$$$>) id 1pGL9d-00E4Ds-5e for $$$REMOVED$$$;
Fri, 13 Jan 2023 15:35:37 +0100
X-Oderland-RCPT-TO: $$$REMOVED$$$
X-Halon-ID: 89bc019a-934f-11ed-9b35-d1fae5a7c13b
Received: from NAM12-MW2-obe.outbound.protection.outlook.com
(mail-mw2nam12on2068.outbound.protection.outlook.com [40.107.244.68]) by
mx1.oderland.com (Halon) with ESMTPS id
89bc019a-934f-11ed-9b35-d1fae5a7c13b; Fri, 13 Jan 2023 15:35:35 +0100 (CET)
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;
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ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed;
d=microsoft.com; s=arcselector9901;
h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1;
bh=4WE/SqEP7bD7EfTg2y4ib7H9A7zMIF9c9gZnX2ZrjV0=;
b=GQ5eJd1K+VK/NOuwQZ1yILYAmd1oshFl7fxJGietiXdF0ycTFeA1Wy0E74Oq3IRS0fMntY00gHF+/7jduus9LCcQsVHV8h+2kHtlt9UchArUg9ZY53R6//CLm63vx0TXL3ymJsgBQ+C77F7OUcc/uU8pw+dA9sxH0qsKJNsJOD4NjVzVx4Yo0R1y6cAUjrS8nx7gIXjJRc+3Yp3WNymN84wU1NP72ePKH5OjozbbQUSgkUle63GdNDLOKPCzBcnoNwvY4g/yax1w2SuK4irEZiuqIww1cocmwoG5zMChLkuC8MKLI9tx0m32x/0uIQUzYFaZp0Pz+sir8z2vF0TqhA==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass
smtp.mailfrom=$$$REMOVED$$$; dmarc=pass action=none
header.from=$$$REMOVED$$$; dkim=pass header.d=$$$REMOVED$$$; arc=none
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=$$$REMOVED$$$;
s=selector2;
h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
bh=4WE/SqEP7bD7EfTg2y4ib7H9A7zMIF9c9gZnX2ZrjV0=;
b=MSXdIYQ38O5VkcYwLBq6mYyglIbOBsEFEnq/xOiYaI1P7nl3PKbpQsR91v0n/4XwQdG4cW2LGSTm3g9Xd82FLKkPJ4Px9uphipCsy57NekawZLhSrYbZhxT008SzxTf2JaV8k+SZIl7SwCGt+p+pcsMdbfrbj4BSQiMD0bWN4hU=
Received: from BN9PR11MB5324.namprd11.prod.outlook.com
(2603:10b6:408:119::19) by BL1PR11MB5979.namprd11.prod.outlook.com
(2603:10b6:208:386::9) with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.13; Fri, 13 Jan
2023 14:35:31 +0000
Received: from BN9PR11MB5324.namprd11.prod.outlook.com
([fe80::a053:f7fb:58e2:b1f5]) by BN9PR11MB5324.namprd11.prod.outlook.com
([fe80::a053:f7fb:58e2:b1f5%2]) with mapi id 15.20.5986.019; Fri, 13 Jan
2023 14:35:31 +0000
Content-Type: multipart/mixed;
boundary="_000_BN9PR11MB5324A5327CB2B03F1326709EA7C29BN9PR11MB5324namp_"
From: $$$REMOVED$$$ <$$$REMOVED$$$>
To: "$$$REMOVED$$$ ($$$REMOVED$$$)" <$$$REMOVED$$$>
Subject: kan du uppdatera 29536
Thread-Topic: kan du uppdatera 29536
Thread-Index: AdknXEgqy/F/9QSkS8CzPFlrxsEpjA==
Date: Fri, 13 Jan 2023 14:35:31 +0000
Message-ID:
<BN9PR11MB5324A5327CB2B03F1326709EA7C29@BN9PR11MB5324.namprd11.prod.outlook.com>
Accept-Language: sv-SE, en-US
Content-Language: sv-SE
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
<BN9PR11MB5324A5327CB2B03F1326709EA7C29@BN9PR11MB5324.namprd11.prod.outlook.com>
authentication-results: dkim=none (message not signed)
header.d=none;dmarc=none action=none header.from=$$$REMOVED$$$;
x-ms-publictraffictype: Email
x-ms-traffictypediagnostic: BN9PR11MB5324:EE_|BL1PR11MB5979:EE_
x-ms-office365-filtering-correlation-id:
7e4b6a57-7242-4329-dc7b-08daf5736c7c
x-ms-exchange-senderadcheck: 1
x-ms-exchange-antispam-relay: 0
x-microsoft-antispam: BCL:0;
x-microsoft-antispam-message-info:
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x-forefront-antispam-report:
CIP:255.255.255.255;CTRY:;LANG:sv;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BN9PR11MB5324.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(396003)(136003)(346002)(366004)(376002)(39860400002)(451199015)(6506007)(2906002)(76116006)(5660300002)(52536014)(8936002)(99936003)(122000001)(64756008)(6916009)(8676002)(9686003)(66446008)(558084003)(38100700002)(41300700001)(33656002)(478600001)(38070700005)(166002)(7116003)(26005)(66946007)(66556008)(55016003)(186003)(7696005)(66476007)(86362001)(71200400001)(316002)(19628015004);DIR:OUT;SFP:1101;
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MIME-Version: 1.0
X-OriginatorOrg: $$$REMOVED$$$
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource:
BN9PR11MB5324.namprd11.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id:
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X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Jan 2023 14:35:31.5888
(UTC)
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--_000_BN9PR11MB5324A5327CB2B03F1326709EA7C29BN9PR11MB5324namp_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Med v=E4nliga h=E4lsningar / Best regards
$$$REMOVED$$$
$$$REMOVED$$$
$$$REMOVED$$$
$$$REMOVED$$$
$$$REMOVED$$$
$$$REMOVED$$$
$$$REMOVED$$$
$$$REMOVED$$$
[cid:image001.png@01D92764.AA155D40]<https://goo.gl/WIeR1i> [cid:image002=
.png@01D92764.AA155D40] <https://goo.gl/oseUhV> [cid:image003.png@01D927=
64.AA155D40] <https://goo.gl/cT6NMA> [cid:image004.png@01D92764.AA155D40=
] <https://goo.gl/VW3eZO>
[cid:image005.png@01D92764.AA155D40]
--_000_BN9PR11MB5324A5327CB2B03F1326709EA7C29BN9PR11MB5324namp_
Content-Disposition: attachment; filename="winmail.dat"
Content-Transfer-Encoding: base64
Content-Type: application/ms-tnef; name="winmail.dat"
$$$REMOVED$$$
--_000_BN9PR11MB5324A5327CB2B03F1326709EA7C29BN9PR11MB5324namp_--