Email bounced back ResponseCode 421 Host not reachable

Email bounced back ResponseCode 421 Host not reachable

Dear Team,

Could you help me resolve the below email bounced back issue. we are using Zoho mail for official purpose and some of the important emails are getting bounced.

Kindly help.

Thanks,
Wasim. R



  

-----Original Message-----
From: mailer-daemon@mail.zoho.com [mailto:mailer-daemon@mail.zoho.com]
Sent: Tuesday, June 20, 2017 11:12 PM
To: rvparambi@ncpmoman.com
Subject: Mail Delivery Status Notification (Delay)

 

This message was created automatically by mail delivery system.

 

THIS IS A WARNING MESSAGE ONLY.

 

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

 

The original message was received at Tue, 20 Jun 2017 12:11:32 -0700  from rvparambi@ncpmoman.com [rvparambi@ncpmoman.com]

 

    ----- The following addresses had fatal errors -----   

   [Status: Error, Address: <minister@mocioman.gov.om>, ResponseCode 421, Host not reachable.]

 

Message will be retried for 4 more day(s)

 

    ----- Transcript of session follows -----   

 

Received:from SMEFRVPNEW (85.154.104.211 [85.154.104.211]) by mx.zohomail.com

                with SMTPS id 1497983157230805.8420356563148; Tue, 20 Jun 2017 11:25:57 -0700 (PDT)  Message-ID:<002d01d2e9f2$6e4eef70$4aecce50$@ncpmoman.com>

Date:Tue, 20 Jun 2017 22:24:15 +0400

From:"Raphael Parambi" <rvparambi@ncpmoman.com>

To:"\(official\) ALI SUNAIDY OMAN" <minister@mocioman.gov.om>  Cc:"Abdulla Riyami sunaidi" <alkawader@hotmail.com>,

                "'CEO'" <ceo@smefoman.com>

Subject:Converting problem to opportunity - tax filing by SMEs  Content-Type:multipart/mixed;

                boundary="----=_NextPart_000_002E_01D2EA13.F5608F70"