MX

fala galera, estou com um problema no meu provedor, aparece esta mensagem quanto tento enviar algum email, o que pode ser:

The original message was received at Tue, 25 Jan 2005 20:05:49 -0200
from 200-206-113-124.starsne.com.br [200.206.113.124] (may be forged)

----- The following addresses had permanent fatal errors -----
<[email protected]>
(reason: 554 refused mailfrom because return MX does not exist)

----- Transcript of session follows -----
... while talking to mx.ig.com.br.:
>>> MAIL From:<[email protected]> SIZE=1135
<<< 554 refused mailfrom because return MX does not exist
554 5.0.0 Service unavailable

obrigado...