Reason: 451 unable to verify address ??

[leonard]

寄信後
server 回應這樣的訊息

Response Message :
To: [email protected]
Subject:
Reason: 451 <[email protected]> unable to verify address

信是由 [email protected] 寄到 [email protected]

如有人知如何解決, 煩您教一下吧