本人是MD新手，现遇到一个问题不知如何解决，请大虾们帮助！

公司现在使用域名:www.aaa.com,由于要更新域名使用总部域名:www.bbb.com

现在想保留原有aaa.com域名，同时使用新的bbb.com域名，我在MD里设置

次域bbb.com,但现在遇到问题，当我发邮件到总部同事的邮箱时，邮件发送

不出去，提示找不到此用户，请问应该如果设置，当我内部发往bbb.com这个邮件

域名时，如果找不到此用户就自动发送到总部bbb.com这个邮箱呢？

配置一个邮件转发。

请问如果设置？

配置一个地址别名，就是说，使用原来的aaa.com，然后在地址别名中设置aaa.com----->bbb.com，这样的话，既可以保留原来的域名，发往不同的域也会显示bbb.com

此问题我上次解答过,再贴下吧:
设置-主域-未知:

安全-中转.....

是的，我是按照你的方法设置，但就是发不出去
下面是退信内容：
The attached message had PERMANENT fatal delivery errors!

After one or more unsuccessful delivery attempts the attached message has
been removed from the mail queue on this server.  The number and frequency
of delivery attempts are determined by local configuration parameters.

YOUR MESSAGE WAS NOT DELIVERED TO ONE OR MORE RECIPIENTS!

--- Session Transcript ---
Tue 2008-07-22 15:38:27: Parsing Message <xxxxxxxxxxxxxxxxxxxxxxxx\pd50000059711.msg>
Tue 2008-07-22 15:38:27: From: test@bbb.cn
Tue 2008-07-22 15:38:27: To: william_tang@bbb.cn
Tue 2008-07-22 15:38:27: Subject: test mail
Tue 2008-07-22 15:38:27: Message-ID: <200807221541476408175@bbb.cn>
Tue 2008-07-22 15:38:27: Route slip host: mail.bbb.cn
Tue 2008-07-22 15:38:27: Route slip port: 25
Tue 2008-07-22 15:38:27: MX-record resolution of [mail.bbb.cn] in progress (DNS Server: 192.168.0.254)...
Tue 2008-07-22 15:38:27: No MX records available - delivering directly to host
Tue 2008-07-22 15:38:27: Attempting MX: P=000 D=mail.bbb.cn TTL=(60) MX=[mail.aaa.cn]
Tue 2008-07-22 15:38:27: Attempting SMTP connection to [mail.bbb.cn : 25]
Tue 2008-07-22 15:38:27: A-record resolution of [mail.bbb.cn] in progress (DNS Server: 192.168.0.254)...
Tue 2008-07-22 15:38:27: D=freemail-g2.xinnetdns.com TTL=(166) A=[123.100.1.XXX]
Tue 2008-07-22 15:38:27: Attempting SMTP connection to [123.100.1.XXX : 25]
Tue 2008-07-22 15:38:27: Waiting for connection...
Tue 2008-07-22 15:38:27: Connection established (192.168.0.253 : 3930 -> 123.100.1.XXX : 25)
Tue 2008-07-22 15:38:27: Waiting for protocol initiation...
Tue 2008-07-22 15:38:27: <-- 220 freemail-g2.xinnetdns.com ESMTP
Tue 2008-07-22 15:38:27: --> EHLO aaa.com
Tue 2008-07-22 15:38:27: <-- 250-freemail-g2.xinnetdns.com
Tue 2008-07-22 15:38:27: <-- 250-PIPEL*NING
Tue 2008-07-22 15:38:27: <-- 250-8BITMIME
Tue 2008-07-22 15:38:27: <-- 250-SIZE 20480000
Tue 2008-07-22 15:38:27: <-- 250 AUTH LOGIN PLAIN CRAM-MD5
Tue 2008-07-22 15:38:27: --> MAIL From:<test@bbb.cn> SIZE=2210
Tue 2008-07-22 15:38:27: <-- 250 ok
Tue 2008-07-22 15:38:27: --> RCPT To:<william_tang@bbb.cn>
Tue 2008-07-22 15:38:27: <-- 250 ok
Tue 2008-07-22 15:38:27: --> DATA
Tue 2008-07-22 15:38:27: <-- 530 Authentication required
--- End Transcript ---

530 Authentication required
身份验证这关没过,建议你通知总部,把你的IP加到信任列表里

只能通知总部来解决这个问题吗？

因为此方式类似于中继,所以要按中继的规则走了.

总部的邮件托管在ISP那里，是不是要联系ISP？