Cannot send email from Exchange 2007. Brand new install, yet NDR everytime I try to send email outside of our domain. Says User not authenticated...yet everything I have read doesn't make sense as domain users have the right permissions. Any ideas guys? Can someone give me proper setup. I am using an external SMTP Server and EDGE Server role...so hub points to Edge and Edge points to SMTP and SMTP points to Internet andthe reverse (SMTP to EDGE to HUB Transport to Mailbox). Users are on the domain and cannot send outgoing email. Anyone else get this error? 5.7.1 User not authenticated (reporting server is the Hub Transport) I did change the internal email address to be the public domain by default, like I did in 2003, but I am missing something I think...

Are you using Outlook? What version? It seems that the connection between the client and the hub transport would be the issue, please describe how that is configured? Are you configured with a POP or IMAP account? Is theworkstation joined to the domain? Can the same user send mail with outlook web access (even though that would be the client access server)? Can the user send mail to other internal users with Outlook?

Using Web Access, but have Outlook 2007. Servers currently configured as Microsoft shows on their technical support site. No POP3 or IMAP. Not joined to the domain. Internal email flows. Users authenticate to the server for OWA, yet NDR states Hub Transport Server #530 5.7.1 Client was not authenticated. Any ideas? I want secure email to and from the Internet. SMTP Serverto EDGE Server to Hub Transport to Mailbox Mailbox to Hub Transport to EDGE Server to SMTP Server The SMTP is accepting all the anonymous traffic of coarse. Should the EDGE also accept anonymous, but only allow the IP of the SMTP and HUB Transport for connections? Should Hub Transportallow only secured users, yet all IPs due to it also being Client Access using Outlook Anywhere? Microsoft made poor documentation with this version and locked it down so hard that even authenticated users cannot send outbound. HELP!

I don't work for Microsoft or anything, but I think they have pretty good documentation on technet and on http://msexchangeteam.com Exchange 2007 does not require additional authentication from outlook domain users. I have set up several sites and never seen this issue. Are you using rpc/https, or regular mapi connectivity. when you say "Servers currently configured as Microsoft shows on their technical support site", thats not very descriptive, as there are many configuration options defined on the web. from an affected client computer, click start, run and type \\exchangeservername if you are prompted for a password, your issues are outside the scope of just exchange itself.