Telnet is disabled by default in Windows 10. So what happens when you need to test telnet or specific ports and you don’t want to use putty.
In an elevated command prompt enter the following
dism /online /Enable-Feature /FeatureName:TelnetClient
Test by typing “telnet” in the command prompt.
You can now do awesome commands like “telnet myemailserver.mydomain.xyz imap”.