Mail from a single domain rejected due to DMARC error

Hi,

I use zoneedit to forward all email sent to *@<mydomain>.com to my gmail account. This works great for everyone sending me mail, except for my ex-colleagues at Royal Bank of Scotland. <Insert joke about all the bad things that RBS did and why they deserve to be blacklisted.>

There is no chance that I can get Royal Bank of Scotland to change their email configuration. Is there a way to white-list the single domain "natwestmarkets.com"?

Thanks in advance!

Here is the bounce error:

Code:
This is the mail system at host mxc02.zoneedit.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

<actual-gmail-account-redacted@gmail.com> (expanded from <david@actual-domain-redacted.com>): host
    gmail-smtp-in.l.google.com[108.177.121.27] said: 550-5.7.1 Unauthenticated
    email from natwestmarkets.com is not accepted due to 550-5.7.1 domain's
    DMARC policy. Please contact the administrator of 550-5.7.1
    natwestmarkets.com domain if this was a legitimate mail. Please visit
    550-5.7.1  https://support.google.com/mail/answer/2451690 to learn about
    the 550 5.7.1 DMARC initiative. u22-v6si15626388iou.70 - gsmtp (in reply to
    end of DATA command)


Here are the headers on the bounce message:

Code:
Received: from stapvma0004.rbsres07.net (11.176.118.103) by
 TRUPVMA0033.rbsres07.net (172.21.118.79) with Microsoft SMTP Server (TLS) id
 14.3.224.2; Tue, 22 May 2018 15:49:55 -0400
Received: from lonms01573.rbsres07.net (11.192.51.113) by
 stapvma0004.rbsres07.net (11.176.118.103) with Microsoft SMTP Server (TLS) id
 8.3.444.0; Tue, 22 May 2018 15:49:54 -0400
Received: from GBWGCEUHUBD0103.rbsres07.net (11.161.50.94) by
 lonms01573.rbsres07.net (11.192.51.113) with Microsoft SMTP Server (TLS) id
 8.3.499.0; Tue, 22 May 2018 20:49:53 +0100
Received: from lonix02000.fm.rbsgrp.net (11.191.217.20) by
 GBWGCEUHUBD0103intranet (11.161.50.94) with Microsoft SMTP Server id
 14.3.352.0; Tue, 22 May 2018 20:49:52 +0100
Received: from unknown (HELO remacdmzma01.rbs.com) ([155.136.80.2])  by
 lonix02001.fm.rbsgrp.net with ESMTP; 22 May 2018 20:49:52 +0100
Received: from mxc02.zoneedit.com ([64.68.198.24])  by remacdmzma01.rbs.com
 with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 May 2018 20:49:50 +0100
Received: by mxc02.zoneedit.com (Postfix)    id EC63E87DF4; Tue, 22 May 2018
 19:49:48 +0000 (UTC)
From:
To: <SRS0=WLpt=IJ=natwestmarkets.com=Christopher.Gardner@srszone.org>
Subject: Undelivered Mail Returned to Sender
Thread-Topic: Undelivered Mail Returned to Sender
Thread-Index: AQHT8gYOmMeWz0QALUyqm7mQL+BQJg==
Date: Tue, 22 May 2018 19:49:48 +0000
Message-ID: <20180522194948.EC63E87DF4@mxc02.zoneedit.com>
Content-Language: en-US
X-MS-Exchange-Organization-AuthMechanism: 10
X-MS-Exchange-Organization-AuthSource: GBWGCEUHUBD0103.rbsres07.net
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-ironport-anti-spam-result: A0F9AACDcwRbhxjGREBHEwMaAQEBAgIBAQEJAQEBgk5HgRF9KIN1lHmBWIEWGoFlhR53gyGDJIULgQ4DGBcvIwuEPgIaggshOBQBAgEBAQEBAQICAhABAQEIDQkIKCMMgmQESyswAQEBAQEBAQEBAQEBAQEBAQEBAQEBARQCDQwnCgwBARgBARcRCkIYCxMEAQEKCgIHCwMCBA0HCQIlCSEigwACgWcDFQUKjimMZIEPAYJpAUQBRwYBiDKBIIIchw4NgSuCDwWGDIIkghOBDzCCKIMEQgKBGwIGAQkBEQIBSgoJCII5MIITEQKHJBETDYRMgSKDU4cNT4VQb4RLNIJ0CxqBHRsjgzCHWYlgSoNWgnqBJTNVLnSEAAkJggkFF4NFilI/MAGOXQEB
x-ironport-anti-spam-filtered: true
x-ironport-av: E=Sophos;i="5.49,430,1520899200";
    d="scan'208,217";a="220154422"
x-wiganss: 01000000010018TRUPVMA0033.rbsres07.net
    ID002E<20180522194948.EC63E87DF4@mxc02.zoneedit.com>
x-ipas-result: A0F9AACDcwRbhxjGREBHEwMaAQEBAgIBAQEJAQEBgk5HgRF9KIN1lHmBWIEWGoFlhR53gyGDJIULgQ4DGBcvIwuEPgIaggshOBQBAgEBAQEBAQICAhABAQEIDQkIKCMMgmQESyswAQEBAQEBAQEBAQEBAQEBAQEBAQEBARQCDQwnCgwBARgBARcRCkIYCxMEAQEKCgIHCwMCBA0HCQIlCSEigwACgWcDFQUKjimMZIEPAYJpAUQBRwYBiDKBIIIchw4NgSuCDwWGDIIkghOBDzCCKIMEQgKBGwIGAQkBEQIBSgoJCII5MIITEQKHJBETDYRMgSKDU4cNT4VQb4RLNIJ0CxqBHRsjgzCHWYlgSoNWgnqBJTNVLnSEAAkJggkFF4NFilI/MAGOXQEB
auto-submitted: auto-replied
Content-Type: multipart/mixed;
    boundary="_005_20180522194948EC63E87DF4mxc02zoneeditcom_"
MIME-Version: 1.0
 
I am sorry...
This is a rejection by Google (not us) due to your colleagues domains DMARC policy.
 
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