[exim] Smart Host Configuration Suggestions

Hi

I have Exim up and running as a smart host for a certain ip block. I would like to know what are the options I can disable in the compile time(such as LDAP and encryption or what else?) Also I would like to know if there are any tweaks I can add in the config. Perhaps if there are sample config lines if you are also using exim as a smart host.

Thanx.