Strange emal problem

Windows 10. Office 365 Business Premium. Outlook 2013 syncing with Exchange online.
I have business dealings with a woman in Kolkata, India. She receives all my emails but when she sends to me they bounce. This started within the last month or so and I've been dealing with her for years without this problem. I've checked she's not on my blocked list. I've checked on https://www.spamhaus.org/ and found her domain is not blocked. I have 3 email addresses on the same domain but the same thing happens when she sends to any of them. I also have an imap/smtp personal account. The same thing happens when she sends to that address. When she uses her Hotmail account I do receive her emails. What's my next move please?
Martin CampbellAsked:
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systechadminConsultantCommented:
can u please please paster the bounce back she is getting that will help us to further assist you
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Martin CampbellAuthor Commented:
SMTP error from remote mail server after RCPT TO:<martin@horton.ie>:
    host horton-ie.mail.protection.outlook.com [213.199.154.87]:
    550 5.7.1 Service unavailable; Client host [109.73.224.152] blocked using Spamhaus; To request removal from this list see http://www.spamhaus.org/lookup.lasso
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Martin CampbellAuthor Commented:
Hi Gaurav,
Below is the full bounce back message

-----Original Message-----
From: Mail Delivery System
Sent: Monday, August 24, 2015 5:48 PM
To: sumita@indian-rain.com
Subject: Mail delivery failed: returning message to sender

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. The following address(es) failed:

  martin@horton.ie
    SMTP error from remote mail server after RCPT TO:<martin@horton.ie>:
    host horton-ie.mail.protection.outlook.com [213.199.154.87]:
    550 5.7.1 Service unavailable; Client host [109.73.224.152] blocked using Spamhaus; To request removal from this list see http://www.spamhaus.org/lookup.lasso

------ This is a copy of the message, including all the headers. ------

Return-path: <sumita@indian-rain.com>
Received: from [115.118.215.184] (port=49696 helo=IRPC01) by serv01.c9741.sgvps.net with esmtpa (Exim 4.82) (envelope-from <sumita@indian-rain.com>) id 1ZTqhW-0008ye-TX for martin@horton.ie; Mon, 24 Aug 2015 07:18:11 -0500
Message-ID: <EDF79C25223E467B8D1A7605136A3A2B@IRPC01>
From: "Sumita Ghosh" <sumita@indian-rain.com>
To: "Martin Campbell" <martin@horton.ie>
Subject: TEST
Date: Mon, 24 Aug 2015 17:48:08 +0530
Organization: Indian Rain
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_0021_01D0DE95.09CDA5B0"
X-Priority: 1
X-MSMail-Priority: High
Importance: High
X-Mailer: Microsoft Windows Live Mail 15.4.3555.308
X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3555.308

This is a multi-part message in MIME format.

------=_NextPart_000_0021_01D0DE95.09CDA5B0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

TEST
------=_NextPart_000_0021_01D0DE95.09CDA5B0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<HTML><HEAD></HEAD>
<BODY dir=3Dltr>
<DIV dir=3Dltr>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma'; COLOR: #000000"> <DIV>TEST</DIV></DIV></DIV></BODY></HTML>

------=_NextPart_000_0021_01D0DE95.09CDA5B0--
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systechadminConsultantCommented:
thanks for sharing the information. I check the IP mentioned in the below header "115.118.215.184"

Received: from [115.118.215.184] (port=49696 helo=IRPC01) by serv01.c9741.sgvps.net with esmtpa (Exim 4.82) (envelope-from <sumita@indian-rain.com>) id 1ZTqhW-0008ye-TX for martin@horton.ie; Mon, 24 Aug 2015 07:18:11 -0500

this is 115.118.215.184 is blacklisted causing the issue. Attached the screen shot. kindly ask them rectify it from there end.
Blacklist.jpg
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