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User Authentication and Registration
User Profile and Preferences
Spam Detection
Sending and receiving emails
Spam Detection
Tagging groups and contacts
Scalability
Availability
Security
Estimate the scale of the system you are going to design...
/signUp - Post Call with username and Password.
/login - Post call with username and Password . Returning a jwt token to clients
/updatePreferences using Authenticated token
/searchEmails Using query params
/send Emails - Used for sending emails
Defining the system data model early on will clarify how data will flow among different components of the system. Also you could draw an ER diagram using the diagramming tool to enhance your design...
Explain how the request flows from end to end in your high level design. Also you could draw a sequence diagram using the diagramming tool to enhance your explanation...
Dig deeper into 2-3 components and explain in detail how they work. For example, how well does each component scale? Any relevant algorithm or data structure you like to use for a component? Also you could draw a diagram using the diagramming tool to enhance your design...
Explain any trade offs you have made and why you made certain tech choices...
Try to discuss as many failure scenarios/bottlenecks as possible.
What are some future improvements you would make? How would you mitigate the failure scenario(s) you described above?