Knowledgebase: CloudFlare
Are there domains I shouldn't enable with CloudFlare?

Only CNAME records have the option to be powered by CloudFlare. However, not all CNAME records are appropriate to pass through the CloudFlare system.

To decide which records pass through the CloudFlare network, you need to understand what type of content appears on that subdomain. You should enable CloudFlare for any subdomain that gets web traffic. You should not enable CloudFlare for subdomains that handle non-web traffic, such as mail, ftp, and ssh.

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