Returned mail: Data format error

[Automatic Email Delivery Software]

The original message was received at Wed, 21 Mar 2007 12:59:29 +0100 from linux.cz [209.232.141.35]

----- The following addresses had permanent fatal errors -----
<sendmail na linux.cz>

----- Transcript of session follows -----
... while talking to linux.cz.:
554 Service unavailable; [208.92.188.39] blocked using relays.osirusoft.com, reason: Blocked
Session aborted, reason: lost connection

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