The message was undeliverable due to the following reason(s):
Your message was not delivered because the destination server was not reachable within the allowed queue period. The amount of time a message is queued before it is returned depends on local configura- tion parameters.
Most likely there is a network problem that prevented delivery, but it is also possible that the computer is turned off, or does not have a mail system running right now.
Your message could not be delivered within 8 days: Host 188.8.131.52 is not responding.
The following recipients did not receive this message: firstname.lastname@example.org
Please reply to email@example.com if you feel this message to be in error.