no key for signature

[Andre]

Guten Morgen,

Mailserver von outlook lehnen unsere Mails ab.

Weiter unten die relevanten Header.

Den Grund für die Ablehnung kann ich nicht nachvollziehen.

Habt ihr einen Tipp für mich?

Mails an yahoo kommen bspw. an.

----------------------------------
Authentication-Results: atlas-production.v2-mail-prod1-gq1.omega.yahoo.com;
  dkim=pass header.i=@myhm.de header.s=202201;
----------------------------------

Hier meine DNS-Records:

202201._domainkey TXT v=DKIM1; h=sha256; k=rsa; s=email; p=********
_dmarc TXT v=DMARC1; p=reject;

Serverantwort:

Remote server returned '550 5.7.509 Access denied, sending domain 
myhm.de does not pass DMARC verification and has a DMARC policy of reject.'

----------------------------------
Received: from AM6P191CA0063.EURP191.PROD.OUTLOOK.COM (2603:10a6:209:7f::40)
  by PR3P250MB0306.EURP250.PROD.OUTLOOK.COM (2603:10a6:102:17d::20) with
  Microsoft SMTP Server (version=TLS1_2,
  cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6886.36; Tue, 
17 Oct
  2023 06:04:40 +0000

Received: from AM2PEPF0001C716.eurprd05.prod.outlook.com
  (2603:10a6:209:7f:cafe::a6) by AM6P191CA0063.outlook.office365.com
  (2603:10a6:209:7f::40) with Microsoft SMTP Server (version=TLS1_2,
  cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6886.35 via 
Frontend
  Transport; Tue, 17 Oct 2023 06:04:40 +0000

Authentication-Results: spf=pass (sender IP is MEINEIP)
  smtp.mailfrom=MEINMAILSERVER.name; dkim=fail (no key for signature)
  header.d=myhm.de;dmarc=fail action=oreject
  header.from=myhm.de;compauth=fail reason=000

Received-SPF: Pass (protection.outlook.com: domain of MEINMAILSERVER.name
  designates MEINEIP as permitted sender)
  receiver=protection.outlook.com; client-ip=MEINEIP;
  helo=MEINMAILSERVER.name; pr=C

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=myhm.de; s=202201;
	t=1697522678; bh=c9HZGMtz02zmCFQoVii4NoS+d6QlRRDd3zHaQ5NY5Hs=;
	h=Date:From:Reply-To:To:Subject:From;
	b=UFF3LKX2RszW7h9+Dc+Qss5oG92KbEIrFCsaEzyVZkTEndB46jc+dyaGpFRe+heYm
	 D0HpRklxVOKke9EAF+5hy3faal2jiwcYvN3JrkchYZ6w9fOEN4vMp1wI2wA6Aw9yHH
	 XThIq25Idr9XUMqxK7DgxOeSXpodQ7Panmju6KWdPkyFN8mv5KLO6qrJ1hwv/ndPLa
	 uoUKwr/czMGliRFo/E25vyxgXPaRMi31Yy6C1pDZwYd0GJl6AE1AKPELsuJHpW2dKm
	 RE2ACeQPfko3mX3wS3O496cTri0hJz+RSgkIenqE0QuiX+Z3MVwCfGAnaR9y7ISbpR
	 XjVCyhK4uHCqQ==

--
LG
Andre