Response code 421 and recepients receveing emalis for many times

Response code 421 and recepients receveing emalis for many times

My clients complaining that he is receveing lots of e-mails from me, and this message arrives in my inbox.

need to solve this what to do?

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, 09 Mar 2017 10:44:30 -0800  from ronaldo@mercatomarketing.com.br [ronaldo@mercatomarketing.com.br]

 

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

   [Status: Error, Address: <contas@ciroradiologia.com.br>, ResponseCode 421, Read timed out]

 

Message will be retried for 4 more day(s)

 

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

 

 Received:from DESKTOPTK0C9Q4 (189.63.70.158 [189.63.70.158]) by mx.zohomail.com

                with SMTPS id 148908160155977.17824611680248; Thu, 9 Mar 2017 09:46:41 -0800 (PST)  Message-ID:<007601d298fd$1c7f2c50$557d84f0$@mercatomarketing.com.br>

 Date:Thu, 9 Mar 2017 14:46:39 -0300

 From:"Ronaldo Spenciere de Paula e Souza" <ronaldo@mercatomarketing.com.br>  To:<contas@ciroradiologia.com.br>

 Subject:RES: ENC: ultimo pedido de balões  Content-Type:multipart/related;

                boundary="----=_NextPart_000_0077_01D298E3.F736AF40"