spamassassin 被今天早上的每日 cronjob 重新启动后，系统日志中充斥着以下错误：
Feb 9 09:24:26 mail spamd[8766]: spamd: got connection over /var/run/spamd.socket
Feb 9 09:24:26 mail spamd[8766]: spamd: setuid to Debian-exim succeeded
Feb 9 09:24:26 mail spamd[8766]: spamd: checking message <004c01d0444a$01d5a905$d690a59f@kiffyv> for Debian-exim:106
Feb 9 09:24:26 mail spamd[8766]: rules: failed to run T_SPF_HELO_PERMERROR test, skipping:
Feb 9 09:24:26 mail spamd[8766]: (Can't locate object method "check_for_spf_helo_permerror" via package "Mail: [...]:SpamAssassin::PerMsgStatus" at (eval 1169) line 19.
Feb 9 09:24:26 mail spamd[8766]: )
Feb 9 09:24:28 mail spamd[8766]: rules: failed to …