Error -wasn't able to deliver

[Leonardo Luiz Padovani da Mata]

When i try to send local mail (in the same domain) i receive this error:
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Hi. This is the qmail-send program at zabumba.coltec.ufmg.br.
I'm afraid I wasn't able to deliver your message to the following
addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<[EMAIL PROTECTED]>:
Sorry. Although I'm listed as a best-preference MX or A for that host,
it isn't in my control/locals file, so I don't treat it as local. (#5.4.6)
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Whats the problem
Leonardo