If I get mail from pielovers.demon.co.uk, and theres no SPF data for pielovers, should I go back one level and test SPF for demon.co.uk?
No. Each subdomain at Demon is a different customer, and each customer might have their own policy. It wouldn’t make sense for Demon’s policy to apply to all its customers by default; if Demon wants to do that, it can set up SPF records for each subdomain. So the advice to SPF publishers is this: you should add an SPF record for each subdomain or hostname that has an A or MX record. Sites with wildcard A or MX records should also have a wildcard SPF record, of the form: * IN TXT “v=spf1 -all” (Thanks to Stuart Cheshire.
No. Each subdomain at Demon is a different customer, and each customer might have their own policy. It wouldn’t make sense for Demon’s policy to apply to all its customers by default; if Demon wants to do that, it can set up SPF records for each subdomain. So the advice to SPF publishers is this: you should add an SPF record for each subdomain or hostname that has an A or MX record.
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