Listing 2: Sample SMTP session

this.machine.com:/home/myaccnt> telnet other.machine.com 25

Trying 10.1.2.111...
Connected to other.machine.com.
Escape character is '^]'.

220 other.machine.com ESMTP Sendmail 8.7.5/8.7.3; Wed, 30 Oct 1996 23:46:43 -0500
HELO this.machine.com
250 other.machine.com Hello myaccnt@this.machine.com [10.1.2.10], pleased to meet you
EXPN myaccnt
250 Bill Schaffer <myaccnt@this.machine.com>
VRFY myaccnt
250 Bill Schaffer <myaccnt@other.machine.com>
QUIT
221 other.machine.com closing connection

Connection closed by foreign host.
this.machine.com:/home/myaccnt>