failure notice

[MAILER-DAEMON]

Hi. This is the qmail-send program at sources.redhat.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.

<spinics.net@xxxxxxxxxxx>:
Sorry, no mailbox here by that name. (#5.1.1)

--- Enclosed are the original headers of the message.
> --- Begin Message ---
> (Body suppressed)
>
> --- End Message ---