Returned mail: Data format error

Your message was undeliverable due to the following reason:

Your message was not delivered because the destination computer was
not reachable 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 1 days:
Mail server 101.104.13.220 is not responding.

The following recipients could not receive this message:
<[email protected]>

Please reply to [email protected]
if you feel this message to be in error.