] SPF is harmful. The architectural ramifications of it
] are so extensive and will have such significant changes
] on the ways that people can access and can use Internet
] mail, that it would actually be less costly to switch to
] an entirely new architecture such as IM2000 Internet mail
] than it would be to switch to SPF and deal with all of
] its consequences properly.

Hrm. This website makes a compelling case that the rush to adopt SPF is premature.

FGA: SPF is harmful. Adopt it.