[Unix-help] Delivery reports about your e-mail

[Returned mail]

The message was not delivered due to the following reason:

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 could not be delivered within 2 days:
Server 131.93.251.211 is not responding.

The following recipients did not receive this message:
<unix-help at mit.edu>

Please reply to postmaster at mit.edu
if you feel this message to be in error.