Many years ago we purchased a domain from Yahoo. Now our website is hosted on Amazon EC2.The output of an SPF checking tool (http://www.kitterman.com/getspf2.py) says: SPF records are primarily published in DNS as TXT records.The TXT records found for your domain are: i=182&m=bizmail-mx2-p9 SPF records should also be published in DNS as type SPF records. No  type SPF records found.Checking to see if there is a valid SPF record. No valid SPF record found of either type TXT or type SPF.Where do I get access to these values? Can somebody speculate, where can I find an interface, or a configuration file to fill in the missing fields?EditTo clarify, the domain name is managed by Yahoo and the actual server is an EC2 instances being routed via an elastic ip.The best I could on the Yahoo control panel only mentions CNAME, A and MX. Where is SPF?Here's a Yahoo help article covering this.
Where do I set my SPF record for domain managed by Yahoo?
email;dns servers;mx
You need to publish those records with your DNS provider. If you don't know who this is, post your real domain in here and we can look it up for you.Note however that not all DNS providers offer the ability to create TXT records; the only way to know for sure is to try it, or to call their support.