If you install imapsync without specifying perl-Mail-IMAPClient-'''2.2.9''' on the command line as shown above, yum will download and install the latest available version of perl-Mail-IMAPClient - currently 3.x - which does not work according to the author of imapsync. If this happens, you will get an error about IMAPClient every time you run imapsync.
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If you have accidentally installed the wrong version of IMAPClient, you can correct the problem using the command below. When done, reinstall imapsync as shown above.