sa-exim not calling spamc to remote host

Hey all. Question here I hope I can get some help with.

I d/led and installed sa-exim 4.0, but I made a change first. My 
spamassassin runs on a different machine (the mail server is nowhere 
near strong enough to handle spamassassin. I tried, and got a system 
load of over 35!)

I changed this line:

ret=execl(SAspamcpath, "spamc", "-s", string_sprintf("%d", 
SAmaxbody+16384), "-U", SAspamcSockPath, NULL);

to be this:


ret=execl(SAspamcpath, "spamc", "-d <Spamassassin Server> -s", 
string_sprintf("%d", SAmaxbody+16384), NULL);


now every message comes in with:

X-SA-Exim-Scanned: No; Unknown failure

but when I take the same message, and run spamc on it myself (sans the 
-s part, like: spamc -d <SpamAssassin Server> < message), it works 
great. I get a message back within about 4-5 seconds that has a spam 
score and everything.

Is there a different way to get sa-exim to poll the remote server? The 
remote server IS listening obviously.

--- Dan