Milter-greylist

Hi,

I have a very busy milter-greylist implimentation running on SuSE 9
which I suspect is running out of process memory. The mail log shows
""milter-greylist: greylist: thread_create() failed: 12" errors" which
goes away when I restart the process. 

I am not a programmer, however I have been logging the number of
threads milter-greylist is creating and have seen it go up to 290. If
I run pmap on the process I can see each thread is taking 8M of memory
so by the time I multiply 8M by 290 and add on the size of the
greylist database (around 300MB) I am starting to approach 3GB which I
believe is the limit for user space memory within a process. 

I am currently waiting for the next errors so I can confirm how many
threads were open at the time.

Have I hit a physical limit or is there any tuning I can carry out to
prevent the problem re-occuring?

Any thoughts appreciated

Regards

Mark Reynolds