From Debian package 0.0.20080702-12

Allow spamd_t the kill capability

Index: policy/modules/services/spamassassin.te
===================================================================
--- policy/modules/services/spamassassin.te.orig
+++ policy/modules/services/spamassassin.te
@@ -287,7 +287,7 @@
 # setuids to the user running spamc.  Comment this if you are not
 # using this ability.
 
-allow spamd_t self:capability { setuid setgid dac_override sys_tty_config };
+allow spamd_t self:capability { kill setgid setuid dac_override sys_tty_config };
 dontaudit spamd_t self:capability sys_tty_config;
 allow spamd_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem execstack execheap };
 allow spamd_t self:fd use;