Below is a message I sent today to the problem email address.  I'm sending
it to the discussion forum now because this seems to be the only place I can
get through to.

Hi. This is the qmail-send program at smtp.netasm.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.

<discuss-owner@plug.phoenix.az.us>:
Sorry, no mailbox here by that name. (#5.1.1)

--- Below this line is a copy of the message.


A couple years ago I was on this discussion list and I believe replies and
for that matter all email was sent to me so I didn't need to go into the
archives. Does that still work?