You should publish spf records for each and every domain you wish to protect from being used by spammers/virusses. If, for example, your domain is somedomain.tld and you furthermore have a subdomain www.somedomain.tld registered, you would publish for both somedomain.tld and www.subdomain.tld (the latter probably being set to "v=spf1 -all"). Note that you will have to publish for each and every A record, including any wildcard (*) or @ entries in your dns.
| | You should publish spf records for each and every domain you wish to protect from being used by spammers/virusses. If, for example, your domain is somedomain.tld and you furthermore have a subdomain www.somedomain.tld registered, you would publish for both somedomain.tld and www.subdomain.tld (the latter probably being set to "v=spf1 -all").
You will have to publish a policy for each and every domain that has an A record, an MX record, or both. This includes wildcard domains (*.example.org) and the domain which forms the top of your [[DNS/Zone|zone]] (@).
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