evan@kny-desktop:~$ telnet mx.primushost.com 25
Trying 209.58.220.226...
Connected to mx.primushost.com.
Escape character is '^]'.
220-mx3.primushost.com ESMTP Exim Fri, 11 Apr 2008 22:36:29 -0400
220-Primus does not authorize the use of its proprietary computers and
220-computernetworks to accept, transmit, or distribute unsolicited bulk
220 e-mail sent from the Internet.
^]

telnet> quit
Connection closed.
evan@kny-desktop:~$