Message could not be delivered

The message was not delivered due to the following reason:

Your message was not delivered because the destination server 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 6 days:
Host 90.200.45.54 is not responding.

The following recipients could not receive this message:
<deal-h_at_lists.village.virginia.edu>

Please reply to postmaster_at_us.aflac.com
if you feel this message to be in error.