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Question about CRON
You should install and enable the plugin, fill in the email address and let it run for 1-2 days. If you get no email, then set up an HOURLY cron job within Cpanel like this:
wget https://your.website.here/index.php?page=cron -O /dev/null
After that you shall get an hourly email and everything is ok. Disable Osclass Internal Cron and also you should disable that plugin, since it is no longer needed.