Mail from company Office 365 is being classified as junk

Here's the good news about the user - they are 89 years old, and receive and send email and texts on their iPad and iPhone.

They are having problems with AOL/Yahoo email

The issue is that they cannot receive email from their son, because for some reason, their son's company domain is on some sort of blacklist.  The company uses Outlook 365 and some sort of mail authenticator  mime cast.com

AOL doesn't have a whitelist option yet.
They have identified the messages as being not spam in the Junk box, but that doesn't stop the mail from going into the junk folder.

It is too much to ask an 89 year old person who has mastered email on devices to change their email address.
I have instructed them to check their junk box as regularly as they check their inbox.

It would be nice if there was a way to get the AOL/Yahoo filtering system to allow mail from the company domain.

I have attached a header from a message that was sent to junk, if that is of any help.

MXtoolbox has analyzed and found messages to be on a blacklist
MX Toolbox report


Thanks.

-------------------------

X-Apparently-To: jwb@aol.com; Wed, 24 Oct 2018 19:01:52 +0000
Return-Path: <john@pxxxxxxp.com>
X-YahooFilteredBulk: 63.128.21.182
Received-SPF: pass (domain of pxxxxxxp.com designates 63.128.21.182 as permitted sender)
X-YMailISG: RD0lkWgWLDt9Eokj4OV7S0B0GjdN9EXqXiK_FGw9i6AP6Su3
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X-Originating-IP: [63.128.21.182]
Authentication-Results: mta4006.aol.mail.ne1.yahoo.com  from=pxxxxxxp.com; domainkeys=neutral (no sig);  from=pxxxxxxp1.onmicrosoft.com; dkim=permerror (bad sig)
Received: from 127.0.0.1  (EHLO us-smtp-delivery-182.mimecast.com) (63.128.21.182)
  by mta4006.aol.mail.ne1.yahoo.com with SMTPS; Wed, 24 Oct 2018 19:01:52 +0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
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Received: from NAM02-SN1-obe.outbound.protection.outlook.com
 (mail-sn1nam02lp0016.outbound.protection.outlook.com [216.32.180.16])
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Received: from BLUPR16MB0258.namprd16.prod.outlook.com (10.162.233.29) by
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Received: from BLUPR16MB0258.namprd16.prod.outlook.com
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 ([fe80::8890:6287:fde1:43ba%8]) with mapi id 15.20.1250.028; Wed, 24 Oct 2018
 19:01:47 +0000
From: John Wxxxxxxxx <john@pxxxxxxp.com>
To: Janice Baxter <jwb@aol.com>
Subject:
Thread-Index: AQHUa8wD/Xuu5yw02kGw/7B2hAqRxQ==
Date: Wed, 24 Oct 2018 19:01:47 +0000
Message-ID: <9B5CC39F-2BE9-429A-A845-EA976BBD45B4@pxxxxxxp.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
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x-originating-ip: [2600:1017:b812:9d83:a511:b485:8dec:a33a]
x-ms-publictraffictype: Email
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x-ms-exchange-antispam-srfa-diagnostics: SOS;
x-ms-office365-filtering-correlation-id: 7fe4e99a-f8d1-43d5-5e49-08d639e325bb
x-microsoft-antispam:
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Content-ID: <B95E908788C224498ABC41195662361D@pxxxxxxp.com>
MIME-Version: 1.0
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X-MS-Exchange-CrossTenant-Network-Message-Id: 7fe4e99a-f8d1-43d5-5e49-08d639e325bb
X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Oct 2018 19:01:47.0817
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--MCBoundary=_11810241501504001
Content-Type: text/plain; charset=WINDOWS-1252
Content-Transfer-Encoding: quoted-printable

Test=20

Sent from my iPhone

--MCBoundary=_11810241501504001
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset=WINDOWS-1252

<HTML><BODY>Test <BR>
<BR>
Sent from my iPhone<BR>
</BODY></HTML>

--MCBoundary=_11810241501504001--
computerlarryAsked:
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David FavorLinux/LXD/WordPress/Hosting SavantCommented:
This is common for Oath properties (Yahoo/AOL).

There are only two fixes.

1) The blacklisted company will have to go through Herculean efforts to make their email deliverable.

2) Person with an Oath email address changes to Gmail.

#1 can take months of time.

#2 only requires setting up a Gmail account.

You'll choose the option which best fits your budget + time constraints.

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David Johnson, CD, MVPRetiredCommented:
It is up to the son's company or the son to fix things.. The son could create a gmail account for communication with the parents until the company gets things in order.
Hani M .S. Al-habshiContributor as IT ExpertCommented:
change Public IP 216.32.180.16
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