dovecot-2.0.9 配置语法问题 ?

bluespy2009

请教下，　这行配置:

mail_location = maildir:/var/mailbox/%d/%n/Maildir

放在dovecot.conf里，dovecot就能启动， 放到 conf.d/10-mail.conf 里dovecot就无法启动， 为什么呢？ 有下面的提示:
doveconf: Fatal: Error in configuration file /etc/dovecot/conf.d/10-mail.conf line 24: Unknown setting: auth_mail_location
但 conf.d/10-mail.conf 里明明有这样的语句示例在那。

尽管前面的方法可以启动了，　启动时还有不少警告信息，不知会不会有问题，有什么参考吗？

doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:25: add auth_ prefix to all settings inside auth {} and remove the auth {} section completely
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:27: passdb sql {} has been replaced by passdb { driver=sql }
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:30: userdb sql {} has been replaced by userdb { driver=sql }
doveconf: Warning: Obsolete setting in /etc/dovecot/conf.d/auth-system.conf.ext:10: passdb  {} has been replaced by passdb { driver= }
doveconf: Warning: Obsolete setting in /etc/dovecot/conf.d/auth-system.conf.ext:49: userdb  {} has been replaced by userdb { driver= }