Cannot send or receive emails

Cannot send or receive emails

When trying to send an email to another user on the same domain connected to the Zoho server, I receive this bounce back 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 Mon, 24 Oct 2016 12:32:07 -0700
from darnold@licketycorp.com [ darnold@licketycorp.com]

----- The following addresses had fatal errors -----
[Status: DOMAIN_NOT_RESOLVED, Address: < darnold@licketycorp.com>, Status: DOMAIN_NOT_RESOLVED, Address: < thines@licketycorp.com>]

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 1477334819970649.2949804520973; Mon, 24 Oct 2016 11:46:59 -0700 (PDT)
Message-ID:< 50654D0D-B649-4EC9-8B27-2FAD2B6C73D0@licketycorp.com>
Date:Mon, 24 Oct 2016 11:46:59 -0700
From:Daniel Arnold < darnold@licketycorp.com>
User-Agent:Zoho Mail
To:THines < thines@licketycorp.com>
Cc:"Daniel Arnold(Daniel Arnold)" < darnold@licketycorp.com>
Subject:Test
Content-Type:text/plain;
charset=us-ascii
ReplyReply AllForwardEdit as new


In addition, we have both not received any emails to these addresses since Sunday (10/23).

Any ideas? Need email back up ASAP for business.

Thanks!