Error when Sending email

Error when Sending email

I have been using Zoho mail service, But When I sent an email to specific address it will  not delivered. I got following message:

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 Thu, 16 Feb 2017 05:25:29 -0800 
from  admin@cbilcapital.com  [ admin@cbilcapital.com

----- The following addresses had fatal errors ----- 
[Status: Error, Address: < samanta.acharya@ctznbank.com >, ResponseCode 421, No SMTP service here] 

Message will be retried for 4 more day(s) 

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

Received:from mail.zoho.com by mx.zohomail.com 
    with SMTP id 148724878237855.022675037228055; Thu, 16 Feb 2017 04:39:42 -0800 (PST) 
Message-ID:<15a46ef7427.f881 b029124988.3256706536794407585@cbilcapital.com
Date:Thu, 16 Feb 2017 18:24:42 +0545 
From:Cbil Capital < admin@cbilcapital.com
User-Agent:Zoho Mail 
To:"samantaacharya" < samanta.acharya@ctznbank.com
Subject:test form zoho 
Content-Type:multipart/alternative; 
    boundary="----=_Part_399133_1424168296.1487248782376"