[求助]为什么不能发送附件？

晴天

安装的MDaemon7.2，发送和接收邮件都没有问题，也能接受带有附件的邮件，但是不能发送带有附件的邮件，系统返回邮件，内容如下：<br>
<br>
<br>
This is the Postfix program at host mail.***.edu.cn.<br>
<br>
I'm sorry to have to inform you that the message returned<br>
below could not be delivered to one or more destinations.<br>
<br>
For further assistance, please send mail to <postmaster><br>
<br>
If you do so, please include this problem report. You can<br>
delete your own text from the message returned below.<br>
<br>
The Postfix program<br>
<br>
<****@***.edu.cn>: permission denied. Command output: maildrop: maildir<br>over quota.<br>
<br>
Reporting-MTA: dns; mail.***.edu.cn<br>
Arrival-Date: Thu, 4 Nov 2004 05:19:55 -0800 (GMT)<br>
<br>
Final-Recipient: rfc822; ****@***.edu.cn<br>
Action: failed<br>
Status: 5.0.0<br>
Diagnostic-Code: X-Postfix; permission denied. Command output: maildrop:<br>maildir over quota.<br>
<br>
<br>
请各位大侠帮助解决。

U-Mail

你可能符合对端的垃圾邮件设置，例如MX记录和IP地址不符合

晴天

是什么限制呢?附件大小限制吗？可我加的附件只有几K啊！

U-Mail

Diagnostic-Code: X-Postfix; permission denied. Command output: maildrop:<br>maildir over quota.<br>
<br>
<br>
超出对端的限制了