Expected behavior

Successful delivery of an email to contact@mbootstrap.com

Actual behavior

Delivery error: The following message to was undeliverable. The reason for the problem: 5.1.2 - Bad destination host 'DNS Hard Error looking up mbootstrap.com (MX): NXDomain'

Resources (screenshots, code snippets etc.)

---------- A copy of the message begins below this line ---------- X-IronPort-DK-Sig: sparkasse-dresden_de Received: from unknown (HELO gz3si.mail.s-web.de) ([172.23.236.46]) by gz1ev.mail.s-web.de with ESMTP/TLS/DHE-RSA-AES256-SHA256; 06 Mar 2023 14:07:44 +0100 Received: from unknown (HELO V968SPWMC1EH543.v968dpc1.v968.intern) () by gz3sm.mail.s-web.de with ESMTP; 06 Mar 2023 14:07:44 +0100 Received: from V968SPWMC1EH504.v968dpc1.v968.intern (17.243.11.204) by V968SPWMC1EH543.v968dpc1.v968.intern (17.243.27.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.17; Mon, 6 Mar 2023 14:07:43 +0100 Received: from V968SPWMC1EH504.v968dpc1.v968.intern (17.243.11.204) by V968SPWMC1EH504.v968dpc1.v968.intern (17.243.11.204) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.17; Mon, 6 Mar 2023 14:07:42 +0100 Received: from V968SPWMC1EH504.v968dpc1.v968.intern () by V968SPWMC1EH504.v968dpc1.v968.intern () with mapi id 15.01.2507.017; Mon, 6 Mar 2023 14:07:42 +0100