我的应用服务器同时是sendmail主机，域名是ld.com，当服务出问题后，想从本地发一封邮件到126.com
现在是可以收到邮件，但是邮件的发送者是
Charlie Root [root@phx2-ss-5-lb.cnet.com]，这个，请教为什么？
怎么样可以让他显示成发送者是root@ld.com
谢谢
我的命令
ld# mail -v -s haha nz126@126.com
adsjdasfljk;faljdsf
.
EOT nz126@126.com... Connecting to [127.0.0.1] via relay...
220 ld.com ESMTP Sendmail 8.14.3/8.14.3; Thu, 21 Mar 2013 16:14:52 +0800 (CST)
>>> EHLO ld.com
250-ld.com Hello localhost [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP
>>> MAIL From:<root@ld.com> SIZE=61
250 2.1.0 <root@ld.com>... Sender ok
>>> RCPT To:<nz126@126.com>
>>> DATA
250 2.1.5 <nz126@126.com>... Recipient ok
354 Enter mail, end with "." on a line by itself
>>> .
250 2.0.0 r2L8EqwG027971 Message accepted for delivery nz126@126.com... Sent (r2L8EqwG027971 Message accepted for delivery)
Closing connection to [127.0.0.1]
>>> QUIT
221 2.0.0 ld.com closing connection