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Im following a guide from Google for Debian and when I ehlo localhost, the console says command not found. May I pls know what is missing that I should install? 
Comments
lol, you need telnet to your SMTP port, then type ehlo localhost
hehe so telnet wasnt installed? I will try to install it and report back. Thank you
@webdev telnet is already installed but still
-su: ehlo: command not found
that means telnet can't connect to your smtp port, so it's quit, you need type that in telnet...
for example, telnet www.google.com 80, and you will know what's it looks like...
You should telnet to localhost:25 (telnet localhost 25) then EHLO
He is trying to type ehlo in a shell as a shell command rather than as part of SMTP protocol.
Ohhhhh thank you everyone so ehlo is command of telnet not of the console! I tried it and it worked!
telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 myhostname ESMTP Postfix (Debian/GNU)
ehlo locahost
250-myhostname
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250 SMTPUTF8