I have use df command to check the server diskspace
and fond that /scratch is 100% used.

can i reduce the file cointain in the /scratch?

[root@mail server sysadmin]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/cciss/c0d0p1 7874528 2182552 5291960 30% /
/dev/cciss/c0d0p3 153794720 91346268 54636044 63% /home
/dev/cciss/c0d0p8 13156256 4500632 7987324 37% /opt
/dev/cciss/c0d0p5 115345508 25602348 83883856 24% /opt/shares
none 451476 0 451476 0% /dev/shm
/dev/cciss/c0d0p6 48062440 45620964 0 100% /scratch
/dev/cciss/c0d0p7 7874528 3135648 4338864 42% /var

well you could delete stuff from it, of course... what's in it? is that a BSD system?

it link with mail archieve mail....

well you can delete some emails then... I'm really not sure what you're expecting to be told here...