high cpu usage!!!

[kfliong]

I am getting very high cpu usage by mailscanner.

177 processes: 163 sleeping, 3 running, 0 zombie, 11 stopped
CPU states: 18.2% user,  4.0% system,  1.0% nice, 31.5% idle
Mem:   504792K av,  474500K used,   30292K free,    1508K shrd,   42668K buff
Swap: 1020116K av,  137800K used,  882316K free                   99664K cached

   PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME COMMAND
31972 root      14   0 25432  20M 12324 R    85.0  4.2   0:19 MailScanner
32019 apache     9   0 10200 7456  5636 S     7.5  1.4   0:00 httpd
32081 root       9   0  1104 1104   804 R     3.7  0.2   0:00 top
32028 apache     9   0  9024 6280  5516 S     0.9  1.2   0:00 httpd


Please help!

thanks