lots of spam getting through all of a sudden

[Mailing List]

Hi All,
 
            Got a problem with Mailscanner/spamassassin everything had
been working fine and it was catching the majority of spam however now
all of a sudden it has just starting letting lots through even stuff it
used to catch.
 
Any ideas what might have happened, server is running latest versions of
Mailscanner and Spamassassin?
 
Regards,
Dee
 
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