There is some use in pop3s and imaps.
For example, if you want to eavesdrop on me, then the easiest way to do so is to listen on the pop3/imap/smtp traffic from my computer to the main server/MTA.
If pop3s/imaps/smtps are used, this will be much harder.
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UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.
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