Mail System Error - Returned Mail

[redhat-list at REDHAT.COM]

This message was not delivered due to the following reason(s):

Your message could not be 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-
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 was not delivered within 4 days:
Mail server 51.59.136.29 is not responding.

The following recipients did not receive this message:
<sw-l at listserv.linguistlist.org>

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