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I used to share documents by email. It is not working now
Without more details it's impossible to help you.
You mean, you used to share document by email using Acrobat/Reader DC and now you can't share it?
If you are trying to share the PDF as attachment, then make sure you have got your email set up correctly. Here are the steps how exactly it works- Share files online with Adobe Acrobat
If your Acrobat/Reader is not responding, then you may check if there's any pending update.
As asked by "try67" without more information it would be difficult to understand the cause of the problem.