Hi! I need to add the SPF register in the domain but I don’t know how to find it… can you please help me? Thank you!
Welcome to the Cloudflare Community. 
If you are referring to an SPF record, that is something that you will need to create. It’s contents are dependent upon the locations authorized to send email using your domain name. If you check with your email provider, they should have information you can use to construct your SPF record.
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