This error message is recieved when someone emails someone but mistypes the domain. The sender receives the message back from MAILER-DAEMON@isp.com
Hi, This is the qmail-send program at isp.com.
I am 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.
username@xxxxxx.com
Sorry, I couldn't find any host named xxxxxx.com. (#5.1.2)
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