WINDOWS 2003 SERVER SMTP伺服器無法寄信到Hotmail 或 Yahoo 信箱(smtp;550 DY-001 Mail rejected)

收不到信的部分：

[3144]05/12/2008 18:14:25.906 450 4.7.1 : Recipient address rejected: Policy Rejection- Please try later.

收件者的信箱拒收。完整錯誤訊息如下
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;550 DY-001 Mail rejected by Windows Live Hotmail for policy reasons. We generally do not accept email from dynamic IP's as they are not typically used to deliver unauthenticated SMTP e-mail to an Internet mail server. http://www.spamhaus.org maintains lists of dynamic and residential IP addresses. If you are not an email/network admin please contact your E-mail/Internet Service Provider for help. Email/network admins, please visit http://postmaster.live.com for email delivery information and support

其原因是
hotmail 判斷您是浮動 IP 拒收。
如果您不是浮動 IP 請依他指示的連結處理。

451 ... Requested mail action not taken: mailbox unavailable
信箱無法使用。

請參考以下連結，您的 IP 被列入垃圾郵件黑名單， 而且是整段，112.116.0.0/16，請洽 Hinet 跟換 IP，或是依以下連結的說明處理。
http://www.spamhaus.org/pbl/query/PBL133756

不過我想若是使用真正的固定IP來使用SMTP服務時，應該就不會有這樣的問題摟