[Mailman-Users] FW: failure notice

[Charu Shankar]

In a listserv I set up, I have trouble posting messages which get returned
to me with the following message. Appreciate your help if anyone has faced
this before:-

Hi. This is the qmail-send program at gao.pair.com.
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.

<roilist at lists4.cstd.ca>:
216.92.1.120 does not like recipient.
Remote host said: 550 <roilist at lists4.cstd.ca>: User unknown
Giving up on 216.92.1.120.