這幾天架了一個MDaemon mail sever，適用seednet adsl 計時制架的，網域為dns2go，
收發信都還算正常，不過只要寄到mail2000 or sina的信件都會退，只是原因不同。

sina是因為sina mail sever無回應，造成over time退信。
mail2000則是下列情況:

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 ANY OF IT'S RECIPIENTS!

Failed address: [email protected]

--- Session Transcript ---
MX-record resolution of [mail2000.com.tw] in progress (DNS Server:
139.175.55.244)...
P=000 D=mail2000.com.tw TTL=(42) MX=[ms6.mail2000.com.tw] {211.72.252.27}
P=000 D=mail2000.com.tw TTL=(42) MX=[bs1.mail2000.com.tw] {211.72.252.191}
Attempting MX: P=000 D=mail2000.com.tw TTL=(42) MX=[bs1.mail2000.com.tw]
{211.72.252.191}
Attempting SMTP connection to [211.72.252.191 : 25]
Waiting for socket connection...
Socket connection established
Waiting for protocol initiation...
220 bs1.mail2000.com.tw ESMTP Service(Mail2000 ESMTP Server V2.71M) ready
Fri, 01 Feb 2002 00:14:52 +0800 (CST)
EHLO ppfamily.dns2go.com
250-bs1.mail2000.com.tw
250-PIPELINING
250-8BITMIME
250-AUTH=LOGIN MAIL2000
250-AUTH LOGIN MAIL2000
250 SIZE 7340032
MAIL From:<[email protected]> SIZE=1950
552 Sorry, we don't allow mail from your host.
QUIT
--- End Transcript ---


我確定DNS應該沒設錯，因為寄到yahoo & seednet & 智邦的mail都沒問題，
而且從mail2000 or sinamail寄至自己所架sever也沒問題，
之前有看過mx設定什麼的，這我不太懂，麻煩大家幫我看看這樣怎樣解決！？

贊助商連結

最初由 chclee 發表

MAIL From:<[email protected]> SIZE=1950
552 Sorry, we don't allow mail from your host.
QUIT
--- End Transcript ---



根據這段話，「我猜」是因為mail2000有預防垃圾郵件的機制，
你的dns2go doman name不在他的容許列表裡面，
所以這封從你的server doman發出的信件被認為是垃圾郵件，因此被退回∼

我以前也是有架過mail server，也是用dns2go，也有類似的問題，
不過我不敢確定真正原因是不是這樣...