DOMAIN NOT RESOLVED error message

DOMAIN NOT RESOLVED error message

I send emails to multiple individuals at the ottawa.ca email, but only get this message for one...?  I get this message every time I send or reply to this particular address.  Your help is appreciated!  


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 Wed, 17 Oct 2018 12:26:30 -0700  

----- The following addresses had fatal errors -----  
[Status: DOMAIN_NOT_RESOLVED, Address: <dumais@localhost>, DOMAIN_NOT_RESOLVED]  

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 1539801685342343.5174917708838; Wed, 17 Oct 2018 11:41:25 -0700 (PDT)  
Message-ID:<16683551d5d.d135cd7149616 .5516054048607889356@tiredsole.com>  
Date:Wed, 17 Oct 2018 14:41:25 -0400  
From:Diane Crocker < diane@tiredsole.com>  
User-Agent:Zoho Mail  
To:Dumais, Isabelle < Isabelle.Dumais@ottawa.ca>  
Subject:Read: RE: TiredSole Invoices for Trust Accounts  
Content-Type:multipart/alternative;  
    boundary="----=_Part_158633_50283849.1539801685341"
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