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$ telnet mail.example.com 25
Trying 127.0.0.42...
...
quit
221 mail.example.com
Connection closed by foreign host.

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Received: (qmail 12019 invoked from network); 2 Sep 2011 01:46:09 
  -0500
...
CC: "Recipient 2" <recipient2@example.com>

test