Amavis+Spamassassin stops to assign score

[kipstar]

Hi all,

My configuration is Postfix+amavis+spamassassin.

This server always worked well until I moved physically this machine 
*from a data center to another one*.

Then some customer begun to complain the presence of too spam in their 
mail account so I monitored a few time the mail.log file and I saw that 
in the line concerning the amavis spam filter by using spamassassin the 
field Hits doesn't show a score but only a dash, i.e.: Hits: -

It happens for every email, even for mail unmistakably spam such as 
penis enlargement or viagra...

*What does it mean when spamassassin doesn't report a score such this 
case? Does it depend on the movement of the server from a data center to 
another with the change of the IP address? And still mailing works and 
web sites too....

*Any suggest?
Thank you so much in advance....

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