I need to unpublish my node after edit. For this I created a rule. It's doing the unpublish of my node after editing. But after this I am not able to again publish this node.
I also need to fire a mail to admin after update.
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Here's how you can do this:
Above steps will unpublish content and notify site admin using email. After which site admin can navigate to "Admin => Content", review the content and approve. If you need to provide a custom/different UI, you can create a list using views and VBO module and allow site admin to Approve Content.
It will be better if you use Work bench access module .It provides various functionality and control over node publish.