Whitelist problem

[#1]

SWMBO receives monthly newsletters from 'The Lady' magazine.
As these were regularly being marked as 'SPAM' I whitelisted the domain some months ago, but it doesn't seem to be working.
Sample source -
From - Fri Aug 07 16:50:53 2015
X-Account-Key: account6
X-UIDL: UID42602-1214892554
X-Mozilla-Status: 0001
X-Mozilla-Status2: 00000000
X-Mozilla-Keys:                                                                               
Return-path: <ladycouk@ladycouk.qpostie20.com>
Envelope-to: xxx@yyy.plus.com
Delivery-date: Fri, 07 Aug 2015 11:00:27 +0100
Received: from [212.159.9.108] (helo=avasin10.plus.net)
  by inmx16.plus.net with esmtp (PlusNet MXCore v2.00) id 1ZNeRv-0007PD-Ly
  for xxx@yyy.plus.com; Fri, 07 Aug 2015 11:00:27 +0100
Received: from p7-10.h.qpostie17.com ([185.73.131.10])
by avasin10.plus.net with Plusnet Cloudmark Gateway
id 1m0Q1r00N0DcZQ901m0T7P; Fri, 07 Aug 2015 11:00:27 +0100
X-BV-Spam-Flag: Yes
X-IPAS: Level1
X-CM-Score: 100.00
X-CNFS-Analysis: v=2.1 cv=TbJrzkkh c=1 sm=1 tr=0 p=SkNwnq-tAAAA:8
a=ap4yzyAAk8ONQfj+GAHWDw==:117 a=ap4yzyAAk8ONQfj+GAHWDw==:17 a=0Bzu9jTXAAAA:8
a=BrdR8i4FAAAA:8 a=lyYuGu4CHa5PaZGX25icmyaRxzw=:19 a=jPJDawAOAc8A:10
a=h5IIv4DSAAAA:8 a=EwoW9oM6AAAA:8 a=EBqGRNqhygqiCd1IRt8A:9
a=88qdN3h3Dyo_KD6m:21 a=C1xhWcpZVqI49BtM:21 a=Iak7XznVQNtxzgSg:21
a=QEXdDO2ut3YA:10 a=_W_S_7VecoQA:10
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=sl; d=lady.co.uk;
h=To:Subject:MIME-Version:Content-Type:Reply-To:List-Unsubscribe:From:List-ID:Message-ID:Date; i=noreply@lady.co.uk;
bh=ZfJ+AHkDcShWSRpS3zDITag1+HE=;
b=QjWYdETIaeFeOGlbfPhzz4/gh7jIb6co+2f40rBz3Y9Dh24FCpeb85ZdxtKGyiODCVWuujm47FEF
  PQkZTBcga4LAdSi1oLljNLnefyCDSLC/yp03vRjM/uyFVBhajKjLRQ+i/bFPjxlllgSQWVO90Wq8
  Dyq19sBHC2NUfFnlXCk=
DomainKey-Signature: a=rsa-sha1; c=nofws; q=dns; s=sl; d=lady.co.uk;
b=J6/tYHdn0NclYgJRVhC4o/7ccH9fnf50SHkPeJDLsLschZndcv4oEixAI7jHC7YtcA6w3YP8vuET
  ymj9jXLvfBlJYQ3e6U2cYIdaEyKO/12SG9W/Gh9irsCaZXxQiUVkCXZAYTYQFRgUuwMWewqUACFF
  rB2U20v3NyXqXsXGlKk=;
To: xxx@yyy.plus.com
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="178e5e7ad008a9f25e2e9179eab6ac311e7a7f984706d10fa8d253b08fb4"
Reply-To: =?UTF-8?Q?The=20Lady?= <noreply@lady.co.uk>
List-Unsubscribe: <mailto:SlC9KPG0saiQGsWrnuzTL5xLj-M@unsubscribe.ladycouk.qpostie20.com>, <http://ladycouk.qpostie20.com/unsubscribe/SlC9KPG0saiQGsWrnuzTL5xLj-M>
X-Mailer: Sendloop Mailer - UID60df6493f424a0b841d196eb04c1069b
X-Feedback-ID: SlC9KPG0saiQGsWrnuzTL5xLj-M:sndlp
X-Job: 5380
X-FBLId: SlC9KPG0saiQGsWrnuzTL5xLj-M
From: =?UTF-8?Q?The=20Lady?= <noreply@lady.co.uk>
X-Report-Abuse: http://ladycouk.qpostie20.com/report-abuse/SlC9KPG0saiQGsWrnuzTL5xLj-M
X-Complaints-To: abuse@sendloop.com
List-ID: Lefe937780e95574250dabe07151bdc23sndlp
Message-ID: <0.6.1D.21C.1D0D0F7789FC820.0@p7-10.h.qpostie17.com>
Date: Fri, 7 Aug 2015 11:57:29 +0200
X-pn-pstn: Spam 1
X-PN-Spam-Filtered: by PlusNet MXCore (v5.00)
Subject: [-SPAM-] =?UTF-8?Q?Meet_the_=E2=80=98Laydee=E2=80=99_Detective?=
--178e5e7ad008a9f25e2e9179eab6ac311e7a7f984706d10fa8d253b08fb4
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: base64

[#2]

Which domain did you whitelist? It needs to be the one in the Return-path header.

[#3]

The 'From' field of the emails reads noreply@lady.co.uk, so following the instructions on the PN Spam Protection setup page -
enter full email or domain addresses (eg. test@test.com or test.com)

I whitelisted lady.co.uk.
I have now amended it to ladycouk.qpostie20.com.
For some reason I said above that the newsletters were monthly; in fact they are weekly, so I shall soon know if all is OK now.
Many thanks for your advice spraxyt.