Amavisd log - Blocked SPAM

Hello,
We are experiencing a Blocked SPAM for a real e-mail on our Tiger Server machine.
An excerpt from /var/log/amavisd.log looks like below:
Jun 29 20:52:49 students.nese.com /usr/bin/amavisd[26186]: (26186-06) Blocked SPAM, <[email protected]> -> <[email protected]>, Hits: 6.718, tag=-999, tag2=4, kill=4, L/Y/Y/Y
Oct 29 04:23:28 students.nese.com /usr/bin/amavisd[7670]: (07670-04) Blocked SPAM, <[email protected]> -> <[email protected]>, Hits: 6.639, tag=-999, tag2=4, kill=4, L/Y/Y/Y
the e-mails from "[email protected]" is a real e-mail and for some reason everything that comes in from uhak.com domain has been "Blocked". We are using zen.spamhaus.org for spam filter and I have checked that uhak.com ip address was not on their blacklist. However this domain was blacklisted someplace else (eg. korea.services.net) BUT we do not use that Korea.services.net service. Also uhak.com's rev DNS lookup resolve to spam.mailwood.com (which sounds suspicious)...
I've read somewhere that Spamassasin does not block spam, it'll just marked it is that true?
Is there a way to allow our mail server to receive emails from uhak.com but still have spam filter on (we do not want to be vulnerable to spams).
Thank you very much for your kind assistance!
Sumomo

This is not being blocked by an RBL (i.e. spamhaus.org), but by SpamAssassin based on other criteria which make it seem spam (can't tell without seeing mail).
I've read somewhere that Spamassasin does not block spam, it'll just marked it is that true?
This depends on the settings in /etc/amavisd.conf. The default setting on Mac OS X Server is to discard spam above kill level and at the same time tag and kill level are set to be the same. Thus, resulting in everything above 4 in your case to be discarded.
Edit /etc/amavisd.conf and change:
$sakill_leveldeflt = $satag2_leveldeflt;
to:
$sakill_leveldeflt = 10.0;
save and restart mail services.
This will mark all spam between 4 and 10, but send it on to the users. Mails above 10 will be discarded.
For more info see here: http://www200.pair.com/mecham/spam/amavisd-settings.html
HTH,
Alex

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    I have the similar problem - I am using Steams environment, and have got this
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    during capture the changes on the primary database, and Capture
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