Homestead-hosted email again being blocked as spam, this time by live.com

Homestead-hosted email again being blocked as spam, this time by live.com.  This is an ongoing issue that Homestead has not resolved.

Two months ago, Homestead set up my account with Cloudflare; I'm not sure how that helps, but it seems to have resolved gmail rejections.

Today, however, I received the following bounce back from a neighbor whose email is hosted by live.com:

 host live-com.olc.protection.outlook.com [52.101.40.3]
   SMTP error from remote mail server after pipelined end of data:
   550 5.7.1 Unfortunately, messages from [65.254.253.170] 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. [Name=Protocol Filter Agent][AGT=PFA][MxId=11BB7CDE77BACA6D] [CY4PEPF0000E9DB.namprd05.prod.outlook.com 2025-07-11T13:46:02.908Z 08DDBE6F3EE298AC]
Reporting-MTA: dns; walmailout01.yourhostingaccount.com

Action: failed
Final-Recipient: rfc822;ericaustin@live.com
Status: 5.0.0
Remote-MTA: dns; live-com.olc.protection.outlook.com
Remote-MTA: X-ip; [52.101.40.3]
X-Remote-MTA-smtp-greeting: X-str; 220 CY4PEPF0000E9DB.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Fri, 11 Jul 2025 13:46:02 +0000 [08DDBE6F3
X-Remote-MTA-helo-response: X-str; 250-CY4PEPF0000E9DB.mail.protection.outlook.com Hello [65.254.253.170]
X-Exim-Diagnostic: X-str; SMTP error from remote mail server after pipelined end of data: 550 5.7.1 Unfortunately, messages from [65.254.253.170] 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. [Name=Protocol Filter Agent][AGT=PFA][MxId=11BB7CDE77BACA6D] [CY4PEPF0000E9DB.namprd05.prod.outlook.com 2025-07-11T13:46:02.908Z 08DDBE6F3EE298AC]
Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [65.254.253.170] 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. [Name=Protocol Filter Agent][AGT=PFA][MxId=11BB7CDE77BACA6D] [CY4PEPF0000E9DB.namprd05.prod.outlook.com 2025-07-11T13:46:02.908Z 08DDBE6F3EE298AC]