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<lejonet>
Shell: spf is actually fairly simple :P
<lejonet>
the SPF record needs to contain a version (which to my memory is v=spf1, I do not know of any other versions of spf) and then a space-delimited list of mailservers which is allowed to send mail for that domain
<lejonet>
For example, I have a domain, dataaturservice.se, which have a mailserver, smtp.dataaturservice.se, in its MX records, and my TXT entry in my DNS is simply "v=spf1 ip4:46.246.118.194 mx:smtp.dataaturservice.se"
<lejonet>
so a minimal TXT entry for SPF for spectrum-os.org, from what I could gather from the DNS would be "v=spf1 mx:spectrum-os.org"
<lejonet>
The wikipedia page is actually quite good for it