Detailed design doc review (Engineering Graduates) - [Tracking] Add a private domain email check to the new user onboarding flow

[melvin-bot[bot]]

:tada: You have been assigned to review a design doc! Here is the tracking issue for [Tracking] Add a private domain email check to the new user onboarding flow .

Once you have reviewed the design doc, head over to the master tracking issue and simply press the Add "Reviewed Doc" comment button in the right hand side K2 panel or follow these instructions. After that, you can close this issue as done. Happy reviewing!