Problem s odeslanim posty

[Petr lascak]

Zdravim konferenci,
stal se mi vcera zajimavy problem. Poslal jsem postu na adresu,
ktera jeste prevcirem fungovala, ale vcera me uz server odmitl
s touto hlaskou. Tak se ptam, jestli to neodporuje RFC? dle meho
muzu prece poslat mail pro uzivatele v domene bez autorizace?

delivery status:

This is the Postfix program at host mail.lbcfree.net.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

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 message returned below.

                        The Postfix program

<sales na inhandelectronics.com>: host mail.inhandelectronics.com[66.165.132.28]
    said: 503 This mail server requires authentication. Please check your mail
    client settings. (in reply to RCPT TO command)


-- 
    Petr Lascak
    ITF FreeNet Liberec