SMTP delivery not allowed (in reply to RCPT TO command)

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Can anyone help explain why this email did not get to recipient ?

This is the mail system at host outbound-smtp02.blacknight.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

< jimreidaccrepair@btinternet.com>: host mx.bt.lon5.cpcloud.co.uk[65.20.0.49]
said: 550 RCPT TO:< jimreidaccrepair@btinternet.com> SMTP delivery not
allowed (in reply to RCPT TO command)
Reporting-MTA: dns; outbound-smtp02.blacknight.com
X-Postfix-Queue-ID: 8395D98E31
X-Postfix-Sender: rfc822; secretary@aovc.co.uk
Arrival-Date: Mon, 6 Mar 2017 11:00:31 +0000 (UTC)

Final-Recipient: rfc822; jimreidaccrepair@btinternet.com
Original-Recipient: rfc822; jimreidaccrepair@btinternet.com
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx.bt.lon5.cpcloud.co.uk
Diagnostic-Code: smtp; 550 RCPT TO:< jimreidaccrepair@btinternet.com> SMTP
delivery not allowed
Return-Path: < secretary@aovc.co.uk>
Received: from mail.blacknight.com (pemlinmail05.blacknight.ie [81.17.254.26])
by outbound-smtp02.blacknight.com (Postfix) with ESMTPS id 8395D98E31
for < jimreidaccrepair@btinternet.com>; Mon, 6 Mar 2017 11:00:31 +0000 (UTC)
Received: (qmail 12954 invoked from network); 6 Mar 2017 11:00:31 -0000
Received: from unknown (HELO sender.zoho.com) ( secretary@aovc.co.uk@[135.84.80.194])
by 81.17.254.9 with ESMTPA; 6 Mar 2017 11:00:29 -0000
Date: Mon, 06 Mar 2017 11:00:27 +0000
From: AOVC Secretary < secretary@aovc.co.uk>
Reply-To: secretary@aovc.co.uk
To: "jimreidaccrepair" < jimreidaccrepair@btinternet.com>
Message-Id: < 15aa3444900.bb4bb5d022413.1415487083056693516@aovc.co.uk>
In-Reply-To: < 15aa3394eec.faab4ba220718.4298041987371956318@mmoc-ni.co.uk>
References: < E1ckq4j-0006rL-Io@smtp04.mailcore.me> < 15aa3394eec.faab4ba220718.4298041987371956318@mmoc-ni.co.uk>
Subject: Minor Restoration
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_Part_71010_2012226789.1488797845767"
X-Priority: Medium
Disposition-Notification-To: "AOVC Secretary" < secretary@aovc.co.uk>
User-Agent: Zoho Mail
X-Mailer: Zoho Mail
X-ZohoMail-Sender: AOVC Secretary
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