Started to look at a system called Notion AI that will allow you to listen to your emails on assistant systems. Here is a general description. And the site for the system Notion and how it can be used with Alexa. Also note that Cortana is starting to provide some moves in this direction. Still, none of these methods works well, they claim to learn and adapt to your communications needs, and give you advice about improving it, but are still not good enough, or trust-able for important needs.
Also described in Lifehacker. and the Notion Blog.