[Exim] refused relay error

Hi,

one email account refuses getting email from any server.
I tested it from the local machine, from machines in the network and
from outside machines, but all emails end up with the following error:

2002-08-14 11:31:01 refused relay (host) to <email@???> from
<email2@???> H=someserver.com [xxx.xxx.xxx.xxx]

...and its also quite weird, because every other account works just
fine and i created the trouble-account just in the same way.

Any help welcome,

regards,

Duncan