Prezados Bom dia

Estou com uma dificuldade referente a enviar e-mails para o dominio uol.
Envio a mensagem, nao retorna mensagem de erro e não chega no destinatário. Despois de alguns dias retorna a seguinte mensagem de erro:

This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 48 hours on the queue on

The message identifier is: 1KVRRe-0002vY-ED
The subject of the message is: =?iso-8859-1?Q?Re:_ROUBO_GUARUJ=C1?=
The date of the message is: Tue, 19 Aug 2008 10:47:47 -0300

The address to which the message has not yet been delivered is:
Delay reason: SMTP error from remote mail server after RCPT
host []: 450 <>:
Sender address rejected: Domain not found

No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.

Para esclarecer estou tentando enviar do dominio (qualquer usuario) para e e ocorre esta dificuldade.

Agradeço a ajuda de vc's para solucionar esta dificuldade ^^