The message was undeliverable due to the following reason(s):
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 was not delivered within 4 days:
Server 188.8.131.52 is not responding.
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if you feel this message to be in error.