帮忙 关于mydestination 的问题

xingsu1021

Aug 21 13:10:35 fbun postfix/trivial-rewrite[1386]: warning: do not list domain fbun.com in BOTH mydestination and virtual_mailbox_domains
Aug 21 13:10:35 fbun postfix/trivial-rewrite[1386]: warning: do not list domain fbun.com in BOTH mydestination and virtual_mailbox_domains
Aug 21 13:10:39 fbun postfix/trivial-rewrite[1386]: warning: do not list domain fbun.com in BOTH mydestination and virtual_mailbox_domains
Aug 21 13:10:39 fbun postfix/trivial-rewrite[1386]: warning: do not list domain fbun.com in BOTH mydestination and virtual_mailbox_domains

当见完postfix+extman后

postfix的main.cf的mydestination 设置为
mydestination =
或者把这个选项注释掉！
但是最后查看的时候依然存在

[root@mail ~]# postconf -d | grep mydestination
mydestination = $myhostname, localhost.$mydomain, localhost
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks
relay_domains = $mydestination
[root@mail ~]# postconf -e mydestination=
[root@mail ~]# postconf -d | grep mydestination
mydestination = $myhostname, localhost.$mydomain, localhost
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks
relay_domains = $mydestination

由于我的hostname和虚拟域一样，所以冲突了！
我不想用mydestination，因此把mydestination清空，但是就是不行
postconf -e mydestination=

声明：我不想该机器名，呵呵！比较懒：）

所以想请问，如何把mydestination 这个参数清空，不让其默认的加载上？