高手们帮看一下，我的qmail发信被拒收

myhstone

Hi. This is the qmail-send program at smile.cn(域名).
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<< katiepowell@uk.dmgworldmedia.com>; :
Connected to 194.129.174.211 but sender was rejected.
Remote host said: 550 This system is configured to reject mail from
XXX.XXX.XXX.XXX(注：IP地址) (DNS reverse lookup failed)

最有可能是什么情况，帮看看解决一下。

myhstone

好的，谢谢两位，我去dns版看看