1、关闭DA监控服务

vi /usr/local/directadmin/data/admin/services.status
把exim和dovecot值改为OFF

2、停止服务和禁止开机启动

service exim stop
chkconfig exim off
service dovecot stop
chkconfig dovecots off

3、损坏（重命名）exim目录

mv /usr/sbin/exim /usr/sbin/exim.old

4、清理邮件队列

cd /var/spool  
mv exim exim.old  
mkdir -p exim/input  
mkdir -p exim/msglog  
mkdir -p exim/db  
chown -R mail:mail exim