I’m trying to telnet my outgoing mail server at command prompt on Windows 7, but I’m getting an error ‘telnet’ is not recognized as an internal or external command, operable program or batch file.
How to solve this problem?
Simply go to Start > Control Panel > Programs > under Programs and Features click Turn Windows features on or off
Then tick Telnet Client and OK button.
After enabling the Telnet Client service, go back again on command prompt and type again telnet [website][port] (e.i. telnet mail.skyinet.net 25)
Hope it helps.