Returned mail: see transcript for details
The message was not delivered due to the following reason:
Your message was not delivered because the destination computer was
unreachable within the allowed queue period. The amount of time
a message is queued before it is returned depends on local configura-
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 7 days:
Mail server 188.8.131.52 is not responding.
The following recipients could not receive this message:
Please reply to firstname.lastname@example.org
if you feel this message to be in error.