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I am installing postfix. I configured the with the local ip I created a in my bdd (phpmyadmin). But when I send an email using telnet, I put : rcpt to: and I have a message error "Temporary lookup failure ". So the mail is not sent, what does this message mean exactly ?

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Look at the error as shown in the postfix mail log -- for security reasons, Postfix does not reveal all it knows to unauthenticated clients.

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