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Sender Policy Framework

FAQ/The demon question

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The Demon Question: What about subdomains?

If I get mail from pielovers.demon.co.uk, and there's 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.)

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Last edited 2005-11-04 22:48 (UTC) by Koen Martens (diff)