Mdaemon server 6.72 無法發信?

我使用Mdaemon server 6.72當郵件伺服器
每次傳送郵件地址是:xxx@cm1.hinet.net 或xxxx@xxxx.seed.net.tw
就會出現下列無法傳出的錯誤訊息是否我設定出了問題
請各位不吝教導小弟 謝謝
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!

Failed address: greenuni@tpts5.seed.net.tw

--- Session Transcript ---
--- End Transcript ---
: Message contains [1] file attachments