blacklists domain hangs mailscanner

[Ramprasad]

Hi

 I am using MS 4.50 on Centos
to implement blacklists I use in Mailscanner.conf 


Is Definitely Spam = %rules-dir%/spam.blacklist.rules


The file contains

---------------
From: 4-c.de and To: netcore.co.in yes
FromOrTo: default no
--------------------

If I restart Mailscanner , mailscanner processes go defunct. 
In debug mode 

I can see  Mailscanner dies with message like 
 MailScanner:       In Debugging mode, not forking...
 at /usr/lib/MailScanner/MailScanner/Config.pm line 1890


Strange thing , 4-c.de doesnt work. But 4-c.com works fine




Thanks
Ram