Will New Sendmail Block Remailers?

Markoff in the NYT reports today on the release of a new Sendmail upgrade by author Eric Allman that will block spam by checking the legitimacy of the originating address before delivery. The report claims that spam is up to 10% of e-mail worldwide, And that Sendmail is used on 75% of the computers that route e-mail, all of which are being fitted with the new program. What are the chances that this will affect remailers or other means of eternal anonymity? Except Sualk, GL, UB and Nuh, all of whom we now know are Otot GinPu Tca as those crazy Syug Irtmid Irun.