Hmm the A record approach is also a bit of a puzzle, you have to make sure the DNS replies fit into UDP packets i guess
Best regards Henrik Schack On Sat, Dec 22, 2012 at 7:40 AM, Henrik Schack <[email protected]> wrote: > That's pretty neat, thanks. > > Best regards > Henrik Schack > > > On Sat, Dec 22, 2012 at 3:17 AM, paul howe <[email protected]> wrote: > >> We placed all of our IP addresses into an DNS A-Record and then >> referenced it in our SPF as A: >> >> Take a look at Delta.com. I was inspired by FedEx.com's design. >> >> > >
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