The following undeliverable or hard bounce message is generated by our mail server indicating that the mail server of the recipient to whom you are trying to send a message cannot be found. This could mean that the recipient’s mail server is not responding or is offline. It could also mean that you have incorrectly typed the host name in the email address. Check to make sure that the address is correct and verify with the recipient that their mail server is active.

Hi. This is the qmail-send program at
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.

Sorry, I couldn’t find any host named (#5.1.2)