Sveiki,
Aisku cia ne OS problema, bet gal kas zinos kaip kovoti su tokiais 
pranesimais:

This is the Postfix program at host xxxx.xxxx.lt.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

			The Postfix program

xxxx@xxxx.lt: host xxxx.xxxx.net[xxx.xxx.xxx.xxx] said: 554
    Service unavailable; Client host [xxx.xxx.xxx.xxx] blocked using
    cbl.abuseat.org; Blocked - see
    http://cbl.abuseat.org/lookup.cgi?ip=xxx.xxx.xx.xxx (in reply to RCPT TO
    command)

Nuejus adresu ir pasalinus is duomenu bazes, po keliu dienu vel tas pats....