[Mimedefang] making spamassassin less sensitive

[Muhammad Talha]

Dear all

i recently shifted my mail server to Mimedefang i have following hardware
and software installed .using default mimedefang and spammassain rules

Processor Pentitum III
RAM 256MB
Swap 512

Sendmail-8.11.12
Mimedefang-2.39
Clamav-0.65
Spamaassain-2.63

Due to lack of RAM system sometime take all the Ram+Swap and i have to
restart mimedefang

i want to make Spamassain less sensitive so that i can save more memory.
Steps i want to take

1) Change mimedefang-filter

if (-s "./INPUTMSG" < 100*1024) {

TO

if (-s "./INPUTMSG" < 50*1024) {

2) Change sa-mimedefang  ( required_hits   12 or higher )

3) change mount /var/spool/MIMEDefang as tmpfs ( size 256m )

4) how to enable embedded Perl interpreter ? to reduce memory usage

5)  Should i had to remove some rules from /usr/share/spamasssain ??

Thanks to author of Mimedefang for making Nice Software :)

any ideas and throught will be helpful ?

Regards

Muhammad Talha