Solve : Cannot send outlook express?

1.	Solve : Cannot send outlook express?
Answer» The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was '[email PROTECTED]'. Subject ' Start saviing for my birthday pressie', Account: 'mail.eftel.net.au', Server: 'mail.eftel.net.au', Protocol: SMTP, Server Response: '451 4.3.0 &LT;[email protected]>: Temporary lookup failure', Port: 25, SECURE(SSL): No, Server Error: 451, Error Number: 0x800CCC79 Can someone ltell me how to fix this? System has been scanned and SEVERAL addresses tried.Error 451 usually indicates that the mail is being rejected by the mail server for a number of reasons. Sometimes the address it is being sent to or from is blacklisted, the IP address it is being sent from is blacklisted, the mail server is too busy to respond, or a number of other things. First, try contacting your ISP or whoever provides this mail service for you and see if they can offer you some explanation, as it is most likely resulting from something on their end.

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