Go to TogaWare.com Home Page. GNU/Linux Desktop Survival Guide
by Graham Williams
Duck Duck Go

SMTP Direct

You can talk directly to an SMTP server, for example to test that it actually works for you. Here's a sample interaction. The commands don't need to be uppercase — they are here just to make the commands obvious.

$ telnet mailhost.act.togaware.com 25
Connected to mailhost.act.togaware.com. 
Escape character is '^]'. 
220 mailhost.act.togaware.com ESMTP Postfix
helo modern.act.togaware.com
250 mailhost.act.togaware.com
mail from: kayon.toga@togaware.com
250 Ok
RCPT TO: graham@togaware.com
250 Ok
354 End data with <CR><LF>.<CR><LF>
Subject: Testing manually through telnet to mailhost
This is the body
250 Ok: queued as 42DDE139919
221 Bye
Connection closed by foreign host.

The EHLO localhost command will list the capabilities of the server.

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Also the author of Data Mining with Rattle and Essentials of Data Science.