Qmail - SMTP

[Webmaster Sports-wear.de]

I have running Qmail for 2 weeks without problems, but last Friday I get
errors.
Here is my Log.

<[EMAIL PROTECTED]>:
62.157.196.171 does not like recipient.
Remote host said: 550 relaying to <[EMAIL PROTECTED]> prohibited by
administrator Giving up on 62.157.196.171.