[Mail] sendmail发邮件奇怪问题，请高手指点！

[weixin_38056491]

请问为什么sendmail不能向某些域名的企业邮箱发邮件呢？例如要发送到liuzhi@***.com,退信内容如下（发送到@163.com等其他邮箱一切正常）：
From [e-mail]  Tue Apr 10 18:08:52 2007
Date: Tue, 10 Apr 2007 18:08:52 +0800
From: Mail Delivery Subsystem <[e-mail]>
To: <[e-mail]>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
        boundary="l3AA8qnD032494.1176199732/localhost.localdomain"
Content-Transfer-Encoding: 8bit
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

This is a MIME-encapsulated message

--l3AA8qnD032494.1176199732/localhost.localdomain

The original message was received at Tue, 10 Apr 2007 18:08:46 +0800
from localhost.localdomain [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<liuzhi@***.com>

   ----- Transcript of session follows -----
... while talking to mail.***.com.:
>>> STARTTLS
<<< 454 TLS missing certificate: error:02001002:system library:fopen:No such file or directory (#4.3.0)
>>> DATA
<<< 553 sorry, Sender verified failure. Please see help on http://support.eqmail.com.(#5.3.3)
>>> RSET [ 本帖最后由 robin10 于 2007-4-10 21:06 编辑 ]