Cloudflare IP on Outlook.com Blocklist

What is the name of the domain?

gaius.org.uk

What is the error number?

550

What is the error message?

Unfortunately, messages from [104.30.6.54] weren’t sent. Please contact your Internet service provider since part of their network is on our block list (S3150)

What is the issue you’re encountering

The IP address 104.30.6.199 g-bjj.cloudflare-email.org is on Outlook’s block list

What steps have you taken to resolve the issue?

No steps I can take other than reporting this

What are the steps to reproduce the issue?

Email relayed via Cloudflare is not delivered to Outlook

A post was merged into an existing topic: Outlook blocked Cloudflare email routing ips