how to block spam to commits-owner at projects.openmoko.org?

[Aapo Rantalainen]

Hi, I have turned off all mailinglists of my project on
projects.openmoko.org.  I have svn enabled and I get spam to address
NAME-commits-owner at projects.openmoko.org

"
As list administrator, your authorization is requested for the
following mailing list posting:
Reason:  Post by non-member to a members-only list
"

What I can do about these? Should I block all messages to commits?
(how I do it?)  Is there any other solution than disabling svn?

-Aapo Rantalainen