Incorrect top-level domain accepted in email-id

[nus-pe-script]

Describe the bug A .p email ID is accepted, despite the fact there is no top-level domain name .p

To Reproduce Steps to reproduce the behavior:

1. Open the application.
2. Enter the following command: add n/Aaa p/432 e/ppp@p.p a/John street, block 123, #01-01
3. See that the invalid email is accepted

Expected behavior Expected email-id to be checked against a list of valid top-level domain names (like .com, .net, .edu, etc), and would reject .p which is invalid.

Screenshots

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_{[original: dummy#28]}