Email nullmailer是否向mail.err发送成功消息？

我已经在debian Squence上安装了nullmailer vi智能。当我检查日志文件时，我注意到即使是成功消息也会记录在mail.err中

你知道为什么以及如何关掉它吗

问候

=========

cat/var/log/mail.err

Feb 27 17:12:07 localhost nullmailer[3528]: smtp: Succeeded: 250 2.0.0 4f4bab56-00012f6e   Message accepted for delivery
Feb 27 17:13:06 localhost nullmailer[3583]: smtp: Succeeded: 250 2.0.0 4f4bab92-00012f70      Message accepted for delivery
Feb 27 17:14:07 localhost nullmailer[3607]: smtp: Succeeded: 250 2.0.0 4f4babcf-00012f71 Message accepted for delivery

默认系统日志配置：

...    
mail.*                          -/var/log/mail.log
user.*                          -/var/log/user.log

#
# Logging for the mail system.  Split it up so that
# it is easy to write scripts to parse these files.
#
mail.info                       -/var/log/mail.info
mail.warn                       -/var/log/mail.warn
mail.err                        /var/log/mail.err
...

我想这是一只虫子

我想这是一个bug

有办法解决它吗