Name or service not known

[May 13 11:29:07 projetos amavis[15282]: (15282-08) Passed CLEAN, [192.168.1.59] <[email protected]> -> <[email protected]>, Message-ID: <000801c557c7$ba0511d0$3b01a8c0@Diretoria>, mail_id: ZQGKS2XtV5aO, Hits: -2.785, 590 ms
May 13 14:29:07 projetos postfix/smtp[15239]: B870711BF37: to=<[email protected]>, relay=127.0.0.1[127.0.0.1], delay=1, status=sent (250 2.6.0 Ok, id=15282-08, from MTA([127.0.0.1]:10025): 250 Ok: queued as 446B811BF39)
May 13 11:29:36 projetos postfix/smtp[15496]: 446B811BF39: to=<[email protected]>, relay=none, delay=29, status=bounced ([sbr00ms04.dominio.com.br]: Name or service not known)
[/code]

"Name or service not known" este erro esta acontecendo para enviar com postfix para alguns dominios e não achei nada que explique o porque deste erro... any help...thanks...