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       $ telnet 127.0.0.1 25
       Trying 127.0.0.1...
       Connected to 127.0.0.1.
       Escape character is '^]'.
       220 domain ESMTP
       helo dude
       250 domain
       mail <me@domain>
       250 ok
       rcpt <me@domain>
       250 ok
       data
       354 go ahead
       Subject: testing
       
       This is a test.
       .
       250 ok 812345679 qp 12345
       quit
       221 domain
       Connection closed by foreign host.
       $
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