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Please provide the bug number here.
Re your Radeon error, as that appears to be your graphics card, typically you would disable advanced features for your graphics card in the system BIOS.
With the mail test I meant for you to initially test using webmail, & as that has proven OK, then additionally test by setting up the email client on a connected workstation or two workstations.
Set up 2 different user accounts in the email client(s), & try to send email from one to the other & vice versa, making sure you use the SME server mail server IMAP & SMTP servers. Do this via the LAN connection.
If it does not work then you probably have a connectivity issue.
Re server manager, I mean to login as admin to the server manager & run through the various configuration panels, particularly the one relating to workgroup & such like.