出错提示:
Hi. This is the qmail-send program at ustc.edu.
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.
MagicMail v2.1 product by AmaxIT.net
<mdkdoc-zh@lists.linux.net.cn>:
211.100.11.220 does not like recipient.
Remote host said: 554 Service unavailable; Client host [218.22.21.7] blocked using dun.dnsrbl.net
Giving up on 211.100.11.220.