I am new to Exchange server. We have installed Echange server and registered our server Ip with a DNS Service. I have checked using NSlookup that the server address is correctly pointing to the IP of our server. I have created MailBox for the user I am sending mail to but when I am trying to send mail from outside I receive a failure notice Diagnostic Code: SMTP;550 5.7.1 Unable to relay for <myuser@myaddress> What am I doing wrong? Please help
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