Hi Ravi, thanks for opening this thread, that sounds like an interesting idea 
I will assume that you are looking for guidance on the summarisation part and not the architecture involving the end-to-end solution (i.e. webscraping, automatically parsing emails, queuing systems, etc).
If so, then I will shamelessly plug a blog post I have written recently that gives a (hopefully) gentle introduction into how to set up a summarisation project with HF: Setting up a Text Summarisation Project | by Heiko Hotz | Dec, 2021 | Towards Data Science
It’s a bit of a longer read, but it is geared towards readers that don’t necessarily have strong HF and/or machine learning expertise.
I hope this is useful, please let me know if you have any questions on that.
Cheers
Heiko