If you’re needing to do some SMTP testing using a Windows Server 2008 host you’re probably going to need a Telnet client. The Telnet client is not installed by default on Windows Server 2008, so you can use this ServerManagerCmd.exe one-liner to quickly install it:
C:\>servermanagercmd -i telnet-client ......... Start Installation... [Installation] Succeeded: [Telnet Client]. <100/100> Success: Installation succeeded.
Try other Cmd:
dism /online /Enable-Feature /FeatureName:TelnetClient
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