Is anyone else having their mail blocked by live.com due to network block list (S3140)?

Live.com is blocking my mail with an error message that says that since my IP is part of an IP range they are blocking, they cannot receive mail from my server. Since I only control my own IP, I do not know how to address this problem.

I have proper SPF and PTR (reverse look-up) records and use TLS authentication before sending. My PostFix server is NOT an open-relay.
According to https://sendersupport.olc.protection.outlook.com/pm/policies.aspx, I meet the Authentication requirements of Section 4, though Sender ID is not relevant to PostFix.

Does anyone know what to do to fix this?

Cheers.

Error Message

<myfriend@live.com>: host live-com.olc.protection.outlook.com[104.47.4.33]
    said: 550 5.7.1 Unfortunately, messages from [www.xxx.yyy.zzz] weren't sent.
    Please contact your Internet service provider since part of their network
    is on our block list (S3140). You can also refer your provider to
    http://mail.live.com/mail/troubleshooting.aspx#errors.
    [AM5EUR02FT015.eop-EUR02.prod.protection.outlook.com] (in reply to MAIL
    FROM command)

Full Error in Message Body

This is the mail system at host host.mydomain.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

<myfriend@live.com>: host live-com.olc.protection.outlook.com[104.47.4.33]
    said: 550 5.7.1 Unfortunately, messages from [www.xxx.yyy.zzz] weren't sent.
    Please contact your Internet service provider since part of their network
    is on our block list (S3140). You can also refer your provider to
    http://mail.live.com/mail/troubleshooting.aspx#errors.
    [AM5EUR02FT015.eop-EUR02.prod.protection.outlook.com] (in reply to MAIL
    FROM command)


Reporting-MTA: dns; host.mydomain.com
X-Postfix-Queue-ID: 7237E120D5
X-Postfix-Sender: rfc822; user@mydomain.com
Arrival-Date: Fri, 26 Feb 2021 12:53:56 +1000 (AEST)

Final-Recipient: rfc822; myfriend@live.com
Original-Recipient: rfc822;myfriend@live.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; live-com.olc.protection.outlook.com
Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [www.xxx.yyy.zzz]
    weren't sent. Please contact your Internet service provider since part of
    their network is on our block list (S3140). You can also refer your
    provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
    [AM5EUR02FT015.eop-EUR02.prod.protection.outlook.com]


Return-Path: <user@mydomain.com>
Received: from localhost (localhost.localdomain [127.0.0.1])
    by host.mydomain.com (Postfix) with ESMTP id 7237E120D5
    for <myfriend@live.com>; Fri, 26 Feb 2021 12:53:56 +1000 (AEST)
X-Virus-Scanned: Debian amavisd-new at host.mydomain.com
Received: from host.mydomain.com ([127.0.0.1])
    by localhost (host.mydomain.com [127.0.0.1]) (amavisd-new, port 10024)
    with ESMTP id ipqV_tDKT5Eo for <myfriend@live.com>;
    Fri, 26 Feb 2021 12:53:55 +1000 (AEST)
Received: from [192.168.0.10] (unknown [w.x.y.z])
    (Authenticated sender: user@mydomain.com)
    by host.mydomain.com (Postfix) with ESMTPSA id D40731208F
    for <myfriend@live.com>; Fri, 26 Feb 2021 12:53:46 +1000 (AEST)
To: myfriend@live.com
From: UserName <user@mydomain.com>
Subject: Testing
Message-ID: <b051d972-b831-12f9-1a97-945caa2fa03b@mydomain.com>
Date: Fri, 26 Feb 2021 12:53:43 +1000
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0)
 Gecko/20100101 Thunderbird/68.12.1
MIME-Version: 1.0
Content-Type: multipart/mixed;
 boundary="------------2EA170EEF8D9C4AD2F76CA1D"
Content-Language: en-AU