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



Thanks.

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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)
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 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
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Test=20

Sent from my iPhone

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<HTML><BODY>Test <BR>
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