SRS whitelist

In the article posted at http://www.linuxjournal.com/article/7328 Meng Wong
states:

The people who developed SPF use eBay, too, and they don't want to lose
e-mail any more than you do. So they came up with a hack. They set up a
whitelist that identifies all these legitimate forgers;
pobox.com<http://pobox.com>is on the list, as are
acm.org <http://acm.org>, eBay and the newspaper Web sites that do "e-mail
me this article".

So how does a legitimate e-mail forwarding service get on this whitelist?

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