Your message was not delivered due to the following reason:
Your message could not be 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-
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 184.108.40.206 is not responding.
The following recipients could not receive this message:
Please reply to postmaster(a)lists.jboss.org
if you feel this message to be in error.