As of SpamAssassin 4.0 whitelist was renamed to welcomelist and blacklist was renamed to blocklist to be more racially sensitive.
This plugin allows you to whitelist or blacklist messages by Subject: header.
Welcomelist subject - welcomelist_subject
Whitelist particular strings in the Subject: header. Any subject matching these patterns will get SUBJECT_IN_WELCOMELIST
-100 score applied to it.
Default: empty
Blocklist subject - blocklist_subject
Blacklist particular strings in the Subject: header. Any subject matching these patterns will get SUBJECT_IN_BLOCKLIST
+100 score applied to it.
Default: empty