postfix and mail relay

Hi all, I am trying to setup a mail relay server running on suse 9.0 (postfix) and gost stuck in the following error: Feb 9 15:09:06 bucosfgw postfix/smtp[10866]: 6A8791FAE: to=, relay=none, delay=1, status=deferred (connect to postfix_host[193.226.31.4]: Connection refused) Do you happen to have any idea where this could come from? Initially it was connect to localhost refused... but now I specified the hostname and still does the same... Thank you Daniel