550 5.7.1 unable to relay ERROR

N

NachoSONDA

I´m using outlook 2003 client in an exchange 2003. My outlook client is
configured to use IMAP. But, when send external mails the folowin error
appears: "error 550.5.7.1 unable to relay to ..... servidor smtp:.... error
0x800cc79".
How can i resolve it??
Thanks
 

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