错误报告邮件如下
/etc/cron.daily/spamassassin:
wget: MIRRORED.BY: Permission denied
error: unable to refresh mirrors file for channel updates.spamassassin.org, using old file
wget: 1742071.tar.gz: Permission denied
wget: 1742071.tar.gz: Permission denied
wget: 1742071.tar.gz: Permission denied
wget: 1742071.tar.gz: Permission denied
channel: could not find working mirror, channel failed
sa-update failed for unknown reasons

解决方法
chown -R debian-spamd:debian-spamd /var/lib/spamassassin
chmod -R 700 /var/lib/spamassassin/