I went to port 25 of this site.
220-server.salmonthievery.com ESMTP Exim 4.68 #1 Sat, 08 Dec 2007 22:48:42 -0500
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
500 unrecognized command
500 unrecognized command
500 unrecognized command
500 Too many unrecognized commands