Email Bounce Back Issue

Copper Contributor

Hi Team i am currently having difficulties in sending emails to few of our clients. The email i sent is not reaching their end; it bounce back. can anyone asssist me on this issue and how to resolve it..

Find below is the email of one of the email that was sent to a client and bounce back.

Delivery has failed to these recipients or groups:
A problem occurred and this message couldn't be delivered. Check to be sure the email address is correct. If the problem continues, please contact your helpdesk.


Diagnostic information for administrators:

Generating server:
Remote Server returned '< #5.4.4 X-Email-Security-Gateway; Host or domain name not found. Name service error for type=A: Host not found>'

Original message headers:

Return-Path: <>X-ASG-Debug-ID: 1600735452-141c8041382e63b0001-aanroaReceived: from ( []) by with ESMTP id PtTjd9kvS9Nj2KD0 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NO) for <>; Tue, 22 Sep 2020 10:44:13 +1000 (+10)X-Barracuda-Envelope-From:[]X-Barracuda-Apparent-Source-IP: YesReceived: from SIAEX01.sia.local ( by SIAEX01.sia.local ( with Microsoft SMTP Server (TLS) id 15.0.995.29; Tue, 22 Sep 2020 10:44:08 +1000Received: from SIAEX01.sia.local ([::1]) by SIAEX01.sia.local ([::1]) with mapi id 15.00.0995.028; Tue, 22 Sep 2020 10:44:08 +1000From: "Andrew AK. Kaiap" <>To: "" <>Subject: testThread-Topic: testX-ASG-Orig-Subj: testThread-Index: AdaQeXid5965f5swR2KBgHRFnCNR8w==Date: Tue, 22 Sep 2020 00:44:07 +0000Message-ID: <fe1f8ee97ba14371af843ba8232dda19@SIAEX01.sia.local>Accept-Language: en-AU, en-USContent-Language: en-USX-MS-Has-Attach: yesX-MS-TNEF-Correlator:x-bromium-msgid: 3e72f0b6-4d1d-42ba-814f-13268d8e0874x-originating-ip: []x-kse-antispam-interceptor-info: fallbackx-kse-antivirus-interceptor-info: fallbackContent-Type: multipart/related;    boundary="_004_fe1f8ee97ba14371af843ba8232dda19SIAEX01sialocal_";        type="multipart/alternative"MIME-Version: 1.0X-Barracuda-Connect:[]X-Barracuda-Start-Time: 1600735452X-Barracuda-Encrypted: ECDHE-RSA-AES256-SHAX-Barracuda-URL: by bsmtpd at 6330X-Barracuda-BRTS-Status: 1X-Barracuda-Spam-Score: 0.00X-Barracuda-Spam-Status: No, SCORE=0.00 using global scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=3.0 KILL_LEVEL=4.0 tests=EXTRA_MPART_TYPE, HTML_MESSAGEX-Barracuda-Spam-Report: Code version 3.2, rules version        Rule breakdown below        pts rule name              description        ---- ---------------------- --------------------------------------------------        0.00 EXTRA_MPART_TYPE       Header has extraneous Content-type:...type= entry        0.00 HTML_MESSAGE           BODY: HTML included in message

2 Replies



The error seems to indicate that the server or appliance you are using to send email could not find the next hop for the domain Make sure that it is a valid domain and than an MX record exists.

Thanks Connor i will check on domain and MX record