Mail System Error - Returned Mail

[MAILER-DAEMON]

The original message was received at Fri, 16 Feb 2007 12:27:20 +0800
from [189.172.119.25]

----- The following addresses had permanent fatal errors -----
editors na linux.cz

----- Transcript of the session follows -----
... while talking to host 73.34.140.123:
554 Service unavailable; [73.153.67.148] blocked using relays.osirusoft.com, reason: Blocked
Session aborted