I find it quite interesting that no on else from Adobe team could find an answer to this nor the KB.
After digging through all of the tools, pref, profile etc, for the Personal edition of Adobe Acrobat with eSign etc the setting is located in:
- https://secure.adobesign.com/public/login
- Login
- Click the Profile Icon in the top right
- Click Settings option
- Settings Pop-Up will appear
- Scroll down to “E-signing settings - Manage your signing preferences, including signatures, notifications, and more” section in the Pop-Up
- Click the Edit settings link
- Only then will you have access to Personal Preferences > My Notifications
- On that sub-section you can tick off all or whatever setting you want disabled for Email notification
- Click Save button when done