Trackback moderation doesn't work

Oi!

I'm using COREblog 1.11 on Zope 2.6.4 (python 2.2.3).  In
order to
avoid trackback spam I have ticked the "Moderate
Trackback" in the
Settings tab, but it doesn't seem to have any effect at
all.
Trackback spam is added, and the tb hook sends me an email
about the
event.  Comment moderation, on the other hand, is working as
expected.

What gives?  And how can I avoid trackback spam?

Cheers,

-- 
Klaus Alexander Seistrup
Copenhagen · Denmark
http://magnetic-ink.dk/
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