Undelivered Mail Returned to Sender

Undelivered Mail Returned to Sender

Hello,

I started receiving the following error message this afternoon:

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This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

artmac@agrm.co.uk Error, ERROR_CODE :550, ERROR_CODE :#5.1.8 Domain of sender address <label@mordgrimm.eu> does not exist


Received:from mail.zoho.com by mx.zohomail.com
    with SMTP id 1383580318267628.196059929172; Mon, 4 Nov 2013 07:51:58 -0800 (PST)
Message-ID:<14223d03a0d.2359988421755774640.2912293457178530082@mordgrimm.eu>
Date:Mon, 04 Nov 2013 15:51:58 +0000
From:mordgrimm <label@mordgrimm.eu>
User-Agent:Zoho Mail
To:Ed Jones - AGR <artmac@agrm.co.uk>
Subject:Re: grimm42cd
Content-Type:multipart/alternative;
    boundary="----=_Part_909157_1880399810.1383580318220"

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I emailed this address this morning without incident, but this afternoon my messages are being returned. It only seems to affect dedicated email addresses, hotmail and the like go though. I would appreciate a quick response.


Sincerely,

N R Harding