John Levine wrote an article on his blog and it was also picked up as
a story on CircleID:
In it, John I guess says that the MAAWG and Earthlink don't much like
SPF. Actually, this is reading between the lines of John's reading
between the lines.
See:
http://www.circleid.com/article/1157_0_1_0_C/
The meat of the story is:
Earlier in July their technical committee quietly released an
evaluation of SPF and Sender-ID[1]. Although it is worded very
tactfully, the message is clear from phrases like;
While MAAWG neither endorses nor discourages the use of SPF or
Sender ID, the technical committee's findings highlight
real-world risks to the delivery of legitimate e-mail when the
specifications are implemented.
At about the same time, Earthlink equally quietly removed the SPF
records they'd been publishing for at least a year. That was
particularly surprising because SPF originator Meng Wong had been
working with Earthlink to get their SPF set up. If Meng can't make
SPF work, who can?
-wayne
[1] http://www.maawg.org/news/maawg050711
http://www.maawg.org/about/whitepapers/spf_sendID
-wayne