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If you just want to use the MX records and A records to control who is valid, then <code>"v=spf1 mx a -all"</code> is the text record that works. This [http://www.spfwizard.net/ wizard] can help. Once you're done, you can check on things with
<code>nslookup -query=mx</code> or <code>nslookup domain 8.8.8.8</code>
== Resources ==