Trying 192.0.2.3...
Connected to 192.0.2.3.
Escape character is '^]'.
220 mx.example.net; ESMTP Mon, 13 Apr 2009 00:09:58 +0200 (CEST)
EHLO example.org
250-mx.example.net Hello [192.0.2.137], pleased to meet you
250-ENHANCEDSTATUSCODES
250 HELP
MAIL FROM:<testuser@example.org>
250 2.1.0 <testuser@example.org>... Sender ok
RCPT TO:<info@example.net>
250 2.1.5 <info@example.net>... Recipient ok
RCPT TO:<nonexistent@example.net>
550 5.1.1 <nonexistent@example.net>... User unknown
QUIT
221 2.0.0 mx.example.net closing connection