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SPF Not Authenticating/Blocking as Expected

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http://forums.cpanel.net – Hello, After reading through SPF: Project Overview and a few other posts on here I was hoping someone could help me work out why SPF isnt working. On my domain I have a txt record of - "v=spf1 a mx a:host1.domain a:host2.domain a:host3.domain a:mobile.domain a:laptop.domain -all" In cPanel SPF is Enabled and it has the following SPF value - "v=spf1 +a +mx +ip4:<Server Public IP> +a:host1.domain +a:host2.domain +a:host3.domain +a:mobile.domain +a:laptop.domain -all" As these .domain hosts are dynamic IPs I am running no-ip for my own domain.com. From my (HowTos)