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Originally Posted by Aragorn
One of the tricks I learnt on my Exchange 5.5 course was how to telnet into the smtp port on a mail server, login and send a simple email 'From' anyone you wanted. Loophole obviously filled ages ago, but was fun at the time.
I use telnet almost every day to login to our Unix hosts, mainly WRQ Reflections client software.
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You can still do much the same thing with SMTP
Hence all the random spam you get from non-existant addresses.