請教RBL rejection錯誤訊息之可能原因

kid0217

請教,某個客戶,寄信過來沒問題,但我方要發信給他時,總是有如下訊息:
550 RBL rejection: direct deliveries from this dynamic/dialup ip refused, use your ISP's smarthost.
我實在想不出我的設定哪裡會有問題,但客戶總把問題指向我方設定有問題.我猜有可能是他在擋垃圾信時,把我們也給擋住了.但苦無明證,請各位前輩對這個錯誤訊息的可能原因指點一下吧,謝謝.

MarchFun

可能是你們的主機被列入 RBL 黑名單了 。而對方又開啟了檢查黑名單站台的機制。

請見：

http://www.suma.tw/modules/ipboar...=&showtopic=876

及

http://www.suma.tw/modules/ipboar...=&showtopic=792

MarchFun

看到了一個重點: dynamic/dialup ip

是不是你們的主機使用的非固定 IP，而是動態的？對方設定了不接受動態 IP 的連線。

kid0217

我們的是中華電信的固定制adsl,非浮動ip,架構上是用ip分享器的虛擬伺服器.關於這個錯誤訊息,我有在網上找到些資料,但仍不明瞭問題所在(尤其是最後幾句,什麼叫直接用ip去連對方,而非用mail server去連對方server...).找的資料如下所示:

For Example:
From: [email protected]
To: [email protected] (email address on 1&1 Mail Servers)

[email protected] tries to send an email to [email protected] but
receives the following error:

Recipient address: [email protected]
Reason: Remote SMTP server has rejected address
Diagnostic code: smtp;550 rejected because of RBL: direct deliveries from
this dynamic/dialup ip refused, use your ISP's smarthost.
Remote system: dns;mx00.1and1.com
(TCP|10.23.32.21|56202|217.160.230.12|25)

This means that the ip(10.23.32.21) address [email protected] is
trying to send email through is listed as a dial up dynamic ip.
Normally if somebody was on an internet connection and sends an email
they would use an email server like smtp.isp.com. This email server
(smtp.isp.com) then makes a connection to the mx server of 1&1.
Now 1&1 server takes the email.

So basically you should use one mail server to connect to another mail
server.

But when you receive the above error it means, that [email protected]
is directly trying to connect to 1&1 mail server from an IP without using a
mail server.