Emails are not coming to my outlook inbox from Cloudflare

General Email Routing
1

What is the name of the domain?

provantatech.com

What is the error number?

550

What is the error message?

upstream (outlook-com.olc.protection.outlook.com.) error: failed to initalize: Unknown error: permanent error (550): 5.7.1 Unfortunately, messages from [104.30.8.4] weren’t sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to Troubleshooting. [Name=Protocol Filter Agent][AGT=PFA][MxId=11BA5808825321A8] [CH2PEPF00000145.namprd02.prod.outlook.com 2025-01-10T20:00:57.721Z 08DD2C044

What is the issue you’re encountering

Emails are not coming to my outlook inbox from Cloudflare

Screenshot of the error

image (21).png
image (21).png1440×403 26.9 KB

2

Hi,

Thank you for reaching out to us. Our team has been monitoring the IP reputation, and we’re actively working to ensure strong deliverability.

However, please note that we have limited control over their response to our traffic, as they do not provide feedback on specific blocks.
Our IP reputation remains positive, but unfortunately, Outlook’s behaviour towards our services is outside our control. Using another email provider may be an option to consider if the issue persists or reach out to their support team for more information.

I hope this helps.