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SMTP mail gateway test

How to test if SMTP email gateway or server is accepting or relaying your emails successfully using commandline option through telnet from Unix or Windows platforms.

telnet smtp
220 ESMTP Postfix
EHLO localhost
250-SIZE 10240000
250 Ok
554 <>: Relay access denied
554 <>: Relay access denied
250 Ok
354 End data with <CR><LF>.<CR><LF>
Subject: test
test 1 2 3
250 Ok: queued as 5152A39097
221 Bye

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