We virtual host (as well as store/forward) for a lot of domains. It is a given to add SPF support, I need to setup records for the main IP and name of our servers. However, what about all the virtuals?
SPF doesn't know or care whether a domain is virtual or "real". So:
Do I only need to setup SPF records for those domains that we actually host/control their DNS?
That's up to you. You can publish SPF records for any/all of the domains that you control the DNS for (and your users can add SPF records themselves if you do not control the DNS).
We also have internal DNS servers for routing email (using BIND) between internally NAT'd servers, do I need to publish SPF records for those as well. Thanks for the clarify.
You don't need to publish SPF records for those, because SPF looks at the return address of the E-mail and compares it to the IP that the E-mail came from. You can only publish SPF records for domains, not mailservers.
-Scott
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