Start a shell, then:
$ telnet justanexample.com 25
Trying 192.168.100.187...
Connected to justanexample.com.
Escape character is '^]'.
220 justanexample.com ESMTP Sendmail 8.11.7p2+Sun/8.11.7; Thu, 12 Jul 2007 18:29:38 -0400 (EDT)
HELO justanexample.com
250 justanexample.com Hello justanexample.com [your IP address], pleased to meet you
MAIL FROM:user1@justanexample.com
250 2.1.0 user1@justanexample.com... Sender ok
RCPT TO:appsdba@yahoo.com
250 2.1.5 appsdba@yahoo.com... Recipient ok
If relaying is denied, then it will give message
550 5.7.1 appsdba@yahoo.com... Relaying denied
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